Calendar mysteries

2.

Bradley, Brian, Nate, and Lucy follow clues to find whoever left a rabbit in their first-grade classroom on Valentine's Day, because they are worried the rabbit will get sick and die of loneliness.

4.

Bradley, Brian, Nate, and Lucy follow clues on an Easter treasure hunt, while trying to figure out who set it up for them.

6.

As a Father's Day gift to the twins' Dad, Bradley, Brian, and their cousins Lucy and Nate try to identify and stop whatever creature is biting fruits and vegetables in the garden.

8.

Bradley, Brian, Nate, and Lucy try to help out the Flying Fortunatos, an acrobatic troupe with a very shabby traveling circus, by identifying the marvelous, hooded trapeze artist they spied rehearsing.

10.

In the tenth book of the Calendar Mysteries, an early chapter-book mystery series featuring the younger siblings of the A to Z Mysteries detectives, there's a haunted house in Green Lawn! It's Halloween, and the Shangri-la Hotel has been transformed into a haunted house, complete with an ogre out front. Bradley, Brian, Nate, and Lucy are ready for some scary fun, but then they notice that none of the kids who have gone in the hotel have come back...

12.

After finding an unusual present--a lost puppy--on Christmas Eve, best friends Bradley, Brian, Nate, and Lucy scramble to find its owner before morning.