After her cousin Zee arrives from England, thirteen-year-old Charlotte and he must set out to save humankind from denizens of the underworld, Nightmares, Death, Pain, and a really nasty guy named Phil.
Thirteen-year-old Charlotte must rescue humankind again when the evil Philonecron captures her cousin Zee, and Poseidon himself sends a sea monster to eat the cruise ship on which Charlotte's parents are trapped.