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.

Reading someone's diary is bad but Slappy is already evil, so how could anyone resist finding out all of this dummy's terrifying secrets? Zoey and Billy Traister find a large suitcase in a trash pile in the empty lot behind their house. Inside: a grinning ventriloquist dummy. Who would throw out a perfectly good dummy? They bring it home and quickly find out why the dummy was tossed in the trash. They read the secret words and bring Slappy to life,...