Thursday, Sept. 26 — Main Library is hosting the Boulder Library Foundation's 50th Gala on Thursday. Second floor public computers will be unavailable and Main will close at 4:30 p.m.
Friday, Sept. 27 — All locations will be closed for staff training.

Hardy Boys mystery stories

Author:
Dixon, Franklin W
 
Showing 1 - 190 of 190
Book cover for "The tower treasure".
Series Volume:
1.
Description:
After a dying criminal confesses that his loot has been stashed "in the tower", the Hardy boys make an astonishing discovery.
Book cover for "The house on the cliff".
Series Volume:
2.
Description:
Frank and Joe Hardy will have to investigate two cases simultaneously: track the smugglers and find the missing father, Fenton Hardy. All the shreds of evidence lead the guys to a house on a cliff where ... a ghost lives! Frank and Joe guess this trick may be a distraction because the place is fraught with a terrible secret that no one should know. But the Hardy brothers boldly go to the mysterious old house.
Book cover for "The secret of the old mill".
Series Volume:
3.
Description:
Teenage detectives Frank and Joe Hardy investigate a case of counterfeiting.
Book cover for "The missing chums".
Series Volume:
4.
Description:
A series of bizarre events in their home town lead the Hardy Boys on a trail of robbers and kidnappers.

5.  Hunting for hidden gold

 
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Series Volume:
5.
Book cover for "The Shore Road mystery".
Series Volume:
6.
Description:
The Hardy brothers try to find out who is behind a rash of automobile thefts that are occurring on Shore Road just outside of Bayport.
Book cover for "The secret of the caves".
Series Volume:
7.
Book cover for "The mystery of Cabin Island".
Series Volume:
8.
Description:
Along with their friends Chet and Biff, the Hardy boys pursue a baffling case of theft on the icebound, snow-covered Cabin Island.
Book cover for "The great airport mystery".
Series Volume:
9.
Book cover for "What happened at midnight".
Series Volume:
10.
Book cover for "While the clock ticked".
Series Volume:
11.
Book cover for "Footprints under the window".
Series Volume:
12.
Book cover for "The mark on the door".
Series Volume:
13.
Description:
The search for a stolen boat leads the Hardy brothers to Mexico where they become involved with a band of Indians and a strange smuggling operation.
Book cover for "The hidden harbor mystery".
Series Volume:
14.
Book cover for "The sinister signpost".
Series Volume:
15.
Description:
The Hardy boys and their father solve a mystery involving inexplicable crashes of highspeed race cars being used to test an experimental turbine motor.
Book cover for "A figure in hiding".
Series Volume:
16.
Book cover for "The secret warning".
Series Volume:
17.
Description:
The Hardy boys assist their father in a complex case for a shipping line's insurance company.
Book cover for "The twisted claw".
Series Volume:
18.
Description:
The Hardy boys embark on another puzzling mystery when they try to discover who is stealing rare collections of ancient pirate treasure and smuggling them out of the United States.
Book cover for "The disappearing floor".
Series Volume:
19.
Book cover for "Mystery of the flying express".
Series Volume:
20.
Description:
After the new hydrofoil they are guarding is stolen, the Hardy boys face frequent danger in solving a mystery involving criminals who operate by signs of the zodiac.
Book cover for "The clue of the broken blade".
Series Volume:
21.
Description:
While searching for the guard end of a broken saber that will solve one mystery, the Hardy brothers become involved with a gang of bank robbers.
Book cover for "The flickering torch mystery".
Series Volume:
22.
Description:
When two suspicious plane accidents occur near an eastern airport, the two Hardy brothers investigate the case and find themselves in greater danger than they anticipated.
Book cover for "The melted coins".
Series Volume:
23.
Description:
Suspecting that their friend has been swindled, the Hardy brothers investigate and find themselves on the trail of a much larger criminal operation.
Book cover for "The short-wave mystery".
Series Volume:
24.
Book cover for "The secret panel".
Series Volume:
25.
Description:
A chance meeting with a stranger on the road provides the Hardy brothers with a clue to a gang of local burglars.
Book cover for "The phantom freighter".
Series Volume:
26.
Description:
When eccentric Thaddeus McClintock invites Frank and Joe Hardy to accompany him on a sea voyage, the teen-age investigators become entangled in a web of mystery. Who is trying to block the three from securing reservations on freighter ships that carry passengers? Does Mr. McClintock have unknown enemies? Or is there a sinister conspiracy afoot to keep Frank and Joe from going on the trip? Is Captain Harkness's report about sighting a phantom freighter...
Book cover for "The secret of Skull Mountain".
Series Volume:
27.
Description:
Every night water strangely disappears from the new reservoir near Skull Mountain. Frank and Joe join forces with a team of skilled engineers to solve the baffling mystery.
Book cover for "The sign of the crooked arrow".
Series Volume:
28.
Description:
The Hardy brothers interrupt their investigations of jewelry-store holdups to answer a plea from their cousin on a New Mexico cattle ranch.
Book cover for "The secret of the lost tunnel".
Series Volume:
29.
Description:
The Hardy boys travel to the Deep South to vindicate a long-dead Confederate general, disgraced during the Civil War because he was accused of stealing hidden gold belonging to a bank.
Book cover for "The wailing siren mystery".
Series Volume:
30.
Description:
Their SOS ignored in a storm, the Hardy boys find a wallet containing two thousand dollars alongside their boat and are launched into a mystery involving diverse clues.
Book cover for "The secret of wildcat swamp".
Series Volume:
31.
Description:
When Frank and Joe go out West to Wildcat Swamp on an archaeological expedition they discover the hiding place of a gang of robbers.
Book cover for "The crisscross shadow".
Series Volume:
32.
Description:
The Hardy boys find the missing deed to an Indians' land, prevent a phony salesman from carrying through a reckless scheme, and help their father solve a top-secret case.
Book cover for "The yellow feather mystery".
Series Volume:
33.
Description:
In trying to trace a missing will, detectives Frank and Joe Hardy trap a dangerous criminal who is willing to risk all--including murder--for money.
Book cover for "The hooded hawk mystery".
Series Volume:
34.
Description:
When their peregrine falcon brings down a homing pigeon carrying rubies, the Hardy brothers find themselves involved with kidnappers.
Book cover for "The clue in the embers".
Series Volume:
35.
Description:
In solving the mystery of two medallions missing from an inherited curio collection, the Hardys wind up in a desolate area of Guatemala at the mercy of dangerous thugs.
Book cover for "The secret of Pirates' Hill".
Series Volume:
36.
Description:
Hired to locate an old Spanish cannon, the Hardy brothers uncover an even greater treasure after perilous underwater adventures.
Book cover for "The ghost at skeleton rock".
Series Volume:
37.
Description:
As a final step in solving a mystery, Frank and Joe face the ghost at Skeleton Rock.
Book cover for "Mystery at Devil's Paw".
Series Volume:
38.
Description:
When they journey to Alaska to help a friend who feels his life is in danger, the Hardy brothers find their own lives threatened.
Book cover for "The Mystery of the Chinese junk".
Series Volume:
39.
Book cover for "Mystery of the desert giant".
Series Volume:
40.
Description:
In search for a man who disappeared close to the desert giants near Blythe, California, Frank and Joe Hardy discover a gang of criminals intent on defrauding the US government.
Book cover for "The clue of the screeching owl".
Series Volume:
41.
Description:
Frank and Joe go to the Pocono Mountains to investigate the mystery of a legendary witch who stalks Black Hollow seeking vengeance. Disappearances occur and strange screams fill the night.
Book cover for "The Viking symbol mystery".
Series Volume:
42.
Description:
The Hardy boys set out in the Northwest Territories to recover a valuable artifact left by the ancient Vikings.
Book cover for "The mystery of the Aztec warrior".
Series Volume:
43.
Book cover for "The haunted fort".
Series Volume:
44.
Description:
Frank and Joe Hardy struggle to locate two stolen paintings that contain clues to hidden treasure.
Book cover for "The mystery of the spiral bridge".
Series Volume:
45.
Book cover for "The secret agent on flight 101".
Series Volume:
46.
Description:
Frank and Joe, the Hardy boys, solve a mystery involving a magician, American secret agents, and international spy ring, and a Scottish castle.
Book cover for "Mystery of the whale tattoo".
Series Volume:
47.
Description:
Helping in a case their father is working on, the Hardy brothers try to find an informer who has telephoned from a booth in their home town, and are hired by a carnival owner to spot pickpockets.
Book cover for "The arctic patrol mystery".
Series Volume:
48.
Description:
While searching in Iceland for a missing sailor sought by an insurance company, the teen-age detective brothers uncover a plot threatening the life of a United States astronaut and the secrets of NASA's moon project.
Book cover for "The Bombay boomerang".
Series Volume:
49.
Description:
The Hardy boys dial a wrong number, get the Pentagon, and suddenly find themselves in a dangerous adventure involving national security.
Book cover for "Danger on Vampire Trail".
Series Volume:
50.
Description:
The Hardy boys and two friends take a camping trip to the Rocky Mountains in an attempt to locate a gang of credit-card counterfeiters.
Book cover for "The masked monkey".
Series Volume:
51.
Description:
The Hardy brothers' search for the missing son of a wealthy industrialist leads them to Brazil and great danger.
Book cover for "The shattered helmet".
Series Volume:
52.
Description:
The Hardy brothers' visiting Greek pen pal enlists their help in searching for a priceless ancient Greek helmet loaned to and lost by a Hollywood movie company years before.
Book cover for "The clue of the hissing serpent".
Series Volume:
53.
Description:
Their efforts to recover a stolen ancient chess piece lead the Hardy brothers to Hong Kong where they help smash an international criminal organization.
Book cover for "The mysterious caravan".
Series Volume:
54.
Description:
On a winter vacation in Jamaica the Hardy boys begin a dangerous adventure when an ancient bronze death mask is discovered near their beach house.
Book cover for "The witchmaster's key".
Series Volume:
55.
Description:
The Hardy boys' investigation of a museum robbery in England arouses the anger of a coven of black witches.
Book cover for "The jungle pyramid".
Series Volume:
56.
Description:
The search for missing gold takes the Hardy boys to the Yucatán Peninsula where they uncover a second mystery.
Book cover for "The firebird rocket".
Series Volume:
57.
Description:
Two teenage sleuths help their detective father search for a famous rocket scientist whose disappearance endangers the launching of the Firebird Rocket.
Book cover for "The sting of the scorpion".
Series Volume:
58.
Description:
During their father's investigation of a ruthless gang of terrorists, two young detectives face several adversaries.
Book cover for "Night of the werewolf".
Series Volume:
59.
Description:
When a ferocious, wolf-life creature appears in a small town, the Hardy boys are engaged to clear the name of a young man who has a history of werewolves in his family.
Book cover for "Mystery of the samurai sword".
Series Volume:
60.
Description:
A Japanese business tycoon mysteriously disappears and, soon after, a rare samurai sword is stolen from an art gallery. Suspecting a connection, the Hardy boys try to solve the mystery.
Book cover for "The Pentagon spy".
Series Volume:
61.
Description:
Valuable antique weathervanes are being stolen in Pennsylvania Dutch country. A Navy employee removes a top secret document from the Pentagon. The Hardy brothers try to solve these two seemingly unrelated mysteries.
Book cover for "The apeman's secret".
Series Volume:
62.
Description:
A "monster" who terrorizes Bayport and a girl who runs away to join a cult are the subjects of the Hardy boys' sleuthing.
Book cover for "The mummy case".
Series Volume:
63.
Description:
Called in to investigate the theft of some statuettes stolen from the Eygptian Museum in New York, the Hardy brothers become involved in a deepening mystery which includes the possible overthrow of another country's government.
Book cover for "Mystery of Smugglers Cove".
Series Volume:
64.
Description:
The art collector who suspects the Hardy boys of stealing one of his valuable paintings offers them a chance to find the painting and the real culprits.
Book cover for "The stone idol".
Series Volume:
65.
Description:
Their search for an Easter Island idol takes the Hardy boys to Easter Island and on to investigate the theft of government material in Antarctica.
Book cover for "The vanishing thieves".
Series Volume:
66.
Description:
The Hardy boys accompany a Canadian teenager to Los Angeles to help locate a missing rare coin, but soon become involved in an even larger case.

67.  The outlaw's silver

 
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Series Volume:
67.

68.  Deadly chase

 
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Series Volume:
68.

69.  The four-headed dragon

 
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Series Volume:
69.

70.  The infinity clue

 
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Series Volume:
70.

71.  Track of the zombie

 
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Series Volume:
71.

72.  The voodoo plot

 
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Series Volume:
72.

73.  The billion dollar ransom

 
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Series Volume:
73.

74.  Tic-tac-terror

 
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Series Volume:
74.

75.  Trapped at sea

 
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Series Volume:
75.

76.  Game plan for disaster

 
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Series Volume:
76.

77.  The crimson flame

 
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Series Volume:
77.

78.  Cave-in

 
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Series Volume:
78.

79.  Sky sabotage

 
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Series Volume:
79.

80.  The roaring river mystery

 
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Series Volume:
80.

81.  The demon's den

 
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Series Volume:
81.

82.  The blackwing puzzle

 
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Series Volume:
82.

83.  The swamp monster

 
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Series Volume:
83.

84.  Revenge of the desert phantom

 
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Series Volume:
84.

85.  The skyfire puzzle

 
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Series Volume:
85.

86.  The mystery of the silver star

 
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Series Volume:
86.

87.  Program for destruction

 
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Series Volume:
87.

88.  Tricky business

 
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Series Volume:
88.

89.  The sky blue frame

 
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Series Volume:
89.

90.  Danger on the diamond

 
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Series Volume:
90.

91.  Shield of fear

 
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Series Volume:
91.

92.  The shadow killers

 
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Series Volume:
92.

93.  The serpent's tooth mystery

 
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Series Volume:
93.

94.  Breakdown in Axeblade

 
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Series Volume:
94.

95.  Danger on the air

 
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Series Volume:
95.

96.  Wipeout

 
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Series Volume:
96.

97.  Cast of criminals

 
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Series Volume:
97.

98.  Spark of suspicion

 
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Series Volume:
98.

99.  Dungeon of doom

 
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Series Volume:
99.

100.  The secret of the island treasure

 
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Series Volume:
100.

101.  The money hunt

 
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Series Volume:
101.

102.  Terminal shock

 
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Series Volume:
102.

103.  The million-dollar nightmare

 
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Series Volume:
103.

104.  Tricks of the trade

 
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Series Volume:
104.

105.  The smoke screen mystery

 
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Series Volume:
105.

106.  Attack of the video villains

 
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Series Volume:
106.

107.  Panic on Gull Island

 
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Series Volume:
107.

108.  Fear on wheels

 
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Series Volume:
108.

109.  The prime-time crime

 
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Series Volume:
109.

110.  The secret of Sigma Seven

 
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Series Volume:
110.

111.  Three-ring terror

 
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Series Volume:
111.

112.  The demolition mission

 
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Series Volume:
112.

113.  Radical moves

 
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Series Volume:
113.

114.  The case of the counterfeit criminals

 
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Series Volume:
114.

115.  Sabotage at Sports City

 
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Series Volume:
115.

116.  Rock 'n' roll renegades

 
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Series Volume:
116.

117.  The baseball card conspiracy

 
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Series Volume:
117.

118.  Danger in the fourth dimension

 
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Series Volume:
118.

119.  Trouble at Coyote Canyon

 
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Series Volume:
119.

120.  The case of the cosmic kidnapping

 
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Series Volume:
120.

121.  The mystery in the old mine

 
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Series Volume:
121.

122.  Carnival of crime

 
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Series Volume:
122.

123.  The robot's revenge

 
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Series Volume:
123.

124.  Mystery with a dangerous beat

 
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Series Volume:
124.

125.  Mystery on Makatunk Island

 
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Series Volume:
125.

126.  Racing to disaster

 
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Series Volume:
126.

127.  Reel thrills

 
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Series Volume:
127.

128.  Day of the dinosaur

 
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Series Volume:
128.

129.  The treasure at Dolphin Bay

 
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Series Volume:
129.

130.  Sidetracked to danger

 
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Series Volume:
130.

131.  Crusade of the flaming sword

 
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Series Volume:
131.

132.  Maximum challenge

 
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Series Volume:
132.

133.  Crime in the kennel

 
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Series Volume:
133.

134.  Cross-country crime

 
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Series Volume:
134.

135.  The hypersonic secret

 
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Series Volume:
135.
Book cover for "The Cold Cash Caper".
Series Volume:
136.
Description:
The Hardys look to put a gang of armed robbers on ice! Frank and Joe have volunteered to do undercover security work at the Bayport winter festival. Their main assignment is to act as bodyguards for the star performer, Olympic gold medal figure skater David Kennedy. Although put on for a good cause-charity-the festival is soon plagued by bad vibes: Money intended for the local children's hospital is ending up in the hands of masked, gun-wielding thugs,...

137.  High-speed showdown

 
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Series Volume:
137.

138.  The Alaskan adventure

 
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Series Volume:
138.

139.  The search for the snow leopard

 
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Series Volume:
139.
Book cover for "Slam Dunk Sabotage".
Series Volume:
140.
Description:
The Hardys and their high school basketball team, the Bayport Bombers, are getting ready to play for their championship. One more victory will put them on top. But somebody's got a different game plan: Blast the Bombers out of contention by knocking Frank and Joe out of the way-for good.

141.  The desert thieves

 
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Series Volume:
141.

142.  Lost in Gator Swamp

 
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Series Volume:
142.

143.  The giant rat of Sumatra

 
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Series Volume:
143.
Book cover for "The Secret of Skeleton Reef".
Series Volume:
144.
Description:
When Frank and Joe find a young woman washed up on the beach of the Caribbean's St. Lucia Island, they realize there's trouble in paradise. Who is the mystery woman? What is she hiding? The answers lie offshore, where a ship's crew scavenges for pirate gold. But in the face of spearguns and man-eating sharks, the Hardys discover that the sea hides more than gold.

145.  Terror at high tide

 
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Series Volume:
145.

146.  The mark of the blue tattoo

 
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Series Volume:
146.

147.  Trial and terror

 
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Series Volume:
147.

148.  The ice-cold case

 
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Series Volume:
148.

149.  The chase for the mystery twister

 
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Series Volume:
149.

150.  The crisscross crime

 
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Series Volume:
150.

151.  The rocky road to revenge

 
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Series Volume:
151.

152.  Danger in the extreme

 
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Series Volume:
152.

153.  Eye on crime

 
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Series Volume:
153.

154.  The caribbean cruise caper

 
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Series Volume:
154.

155.  The hunt for the four brothers

 
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Series Volume:
155.

156.  A will to survive

 
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Series Volume:
156.

157.  The lure of the Italian treasure

 
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Series Volume:
157.

158.  The London deception

 
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Series Volume:
158.
Book cover for "Daredevils".
Series Volume:
159.
Description:
The Hardys get more than they bargain for when they try to help a family friend who is also one of Hollywood's most popular stuntmen.

160.  A game called chaos

 
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Series Volume:
160.
Book cover for "Training for Trouble".
Series Volume:
161.
Description:
JUDO...FENCING...ARCHERY...BIATHLON... SOMEONE WANTS TO WIN-AT ANY COST! The combat sports training facility has just opened in Bayport, and the Hardys are on hand to check it out. They can practice judo, fencing, archery, and biathlon, and meet aspiring athletes from all over. But good times turn to bad sportsmanship when Joe's girlfriend, Iola, gets a nasty electrical shock during a fencing workout. Then someone decides to use Frank for target practice...

162.  The end of the trail

 
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Series Volume:
162.

163.  The spy that never lies

 
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Series Volume:
163.

164.  Skin & bones

 
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Series Volume:
164.

165.  Crime in the cards

 
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Series Volume:
165.

166.  Past and present danger

 
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Series Volume:
166.

167.  Trouble times two

 
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Series Volume:
167.

168.  The castle conundrum

 
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Series Volume:
168.
Book cover for "Ghost of a Chance".
Series Volume:
169.
Description:
IN THE TENNESSEE WOODS, A MOVIE ABOUT A DARING THIEF LANDS THE HARDYS IN DANGER! Years ago Jake "Jumper" Herman bailed out of a plane in the Great Smoky Mountains and disappeared -- with a fortune in treasure. Now Frank and Joe are helping out on a movie about the escape, working with the animal wranglers, who handle trained mountain lions and bears for the film. But the set seems jinxed. A pretty young star's stunt leads to a hair-raising accident,...

170.  Kickoff to danger

 
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Series Volume:
170.
Book cover for "The test case".
Series Volume:
171.
Description:
The Hardy boys try to figure out how a copy of the new statewide test has turned up in Tony's book bag.
Book cover for "Trouble in warp space".
Series Volume:
172.
Description:
On the set of a science fiction television show, Frank and Joe explore a galaxy of danger.
Book cover for "Speed Times Five".
Series Volume:
173.
Description:
CAN THE HARDYS PASS THIS EXTREME TEST OF ENDURANCE AND SKILL? Making it to the finish line of the high-endurance Fire Creek Mountain Race is going to be a real challenge for the Hardys. The five demanding events include downhill mountain biking, kayaking, cross-country hiking and climbing, biking through the city streets of Montreal, and a high-speed SeaZoom race on Lake Champlain. But when dangerous accidents begin to interfere with the events,...
Book cover for "Hide-and-Sneak".
Series Volume:
174.
Description:
SOMETIMES THE BEST ACTING IS DONE BY AMATEURS The Hardys' friend Chet answers an ad in the paper for a role in a student film. There's just one catch: All participants must have a boat, so Chet persuades Frank and Joe to get their motorboat, the Sleuth, out of mothballs. He even convinces the brothers to join him. The aquatic extravaganza will be shot locally on Barmet Bay and will be totally improvised. The director promises clues, cryptic charts,...

175.  In plane sight

 
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Series Volume:
176.

176.  The case of the psychic's vision

 
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Series Volume:
177.

177.  The mystery of the black rhino

 
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Series Volume:
178.

178.  Passport to danger

 
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Series Volume:
179.
Book cover for "Typhoon Island".
Series Volume:
180.
Description:
While vacationing on a tropical island, Frank and Joe Hardy endure "bad luck," face a dangerous typhoon, and struggle to solve a mystery.

180.  Double jeopardy

 
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Series Volume:
181.

181.  The secret of the soldier's gold

 
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Series Volume:
182.

182.  Warehouse rumble

 
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Series Volume:
183.
Book cover for "The Dangerous Transmission".
Series Volume:
184.
Description:
IT'D BE A CRIME TO LOSE THIS TOOTH While on holiday in London, Frank and Joe Hardy learn that a new invention-a voice transmitter that can be implanted in a tooth-has been stolen. The prime suspect is a notorious spy who has recently been spotted in London, but shortly after the Molar Mike is stolen, the Hardys catch a trespasser in the lab where the transmitter originated. The suspect list is growing, and there's little time to spare. To catch...

184.  Wreck and roll

 
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185.

185.  Hidden mountain

 
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Series Volume:
186.

186.  No way out

 
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Series Volume:
187.
Book cover for "Farming Fear".
Series Volume:
188.
Description:
SOMETHING ROTTEN IS LURKING AT THIS RANCH! It's winter in Bayport, but things are heating up at the Morton family farm. It looks like someone is wreaking havoc with the property, and Chet and Iola Morton are worried that their grandparents are in danger of losing it! With their parents out of reach, the Mortons call on Frank and Joe Hardy for help. They need to figure out who's behind the trouble-and fast. The Hardys are hot on the trail, but the...
Book cover for "One False Step".
Series Volume:
189.
Description:
A TRIP TO THE CIRCUS STIRS THE BOYS' SENSES-AND SUSPICIONS. Frank, Joe, and their friends head to Philadelphia to catch a performance of Aerocirque, an amazing circus act with a twist: The acrobats swing and flip from helicopters high in the air! But all is not well in the City of Brotherly Love. The other show in town is a series of robberies, and no one knows how they're being pulled off. Frank and Joe are soon jumping through hoops to find the...
Book cover for "Motocross Madness".
Series Volume:
190.
Description:
Frank and Joe get revved up to race for their lives! The Hardy boys and their friend Jamal are thrilled to be participating in a motorcycle exhibition. It's going to be an exciting weekend, with many talented cyclists heating up the competition and a valuable prize for the winner-a classic motorcycle! But when burglaries and suspicious accidents send the benefit skidding out of control, Frank and Joe find themselves racing to crack another case....

190.  Detective handbook

 
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