Visiting their uncle's seaside home for the summer, a brother and sister open a mysterious trunk in a back room and discover a sinister-looking pirate puppet that comes to life and takes them captive.

Boone and his younger sister Heather are excited about spending the summer at Camp Hither, and at first they dismiss the horror stories about snakes that one camper is spreading, but then strange things start happening.

"What do Maggie and Billy McGee do when they find an abandoned ventriloquist dummy in an empty lot? They take him home, of course! As the pair tries to figure out why someone would throw out a perfectly good dummy, they accidentally bring Slappy to life. A night of horror ensues until the siblings put Slappy back into his case. But when they find Slappy's diary and clues that could lead to gold, they'll have to find Slappy's second diary while evading...

"Monica Anderson thinks her biggest problem is taking her karate-chopping younger brother, Peter, trick-or-treating on Halloween. But she is wrong. After knocking on the door of an old, creepy house the kids are met by a strange woman pleading for their help. The evil Dr. Screem is after five horribly ugly ancient masks. These artifacts have the power to manipulate the world around them. Monica and Peter don't want to help, but they must retrieve...

It's bad enough Ian Barker has to spend his twelfth birthday with his sister and their two annoying cousins. The four of them can't ever hang out without getting into trouble. Vinnie and Jonny always want to play with Ian's stuff. They take extra turns and break everything they touch. Even Ian's new birthday presents are up for grabs. But when Ian gets a Slappy dummy from his dad, things go from bad to worse.

When your brother disappears on Cat Cay Island it's up to you to save him from hundreds of evil mutant cats. Decisions made throughout the story determine the ending.