Goosebumps SlappyWorld - Diary of a Dummy

Billy McGee finds a ventriloquist dummy at the dump. The dummy's name is Slappy, and he causes a whole lot of trouble. But Slappy isn't the only thing Billy discovers. There's a diary as well. What do you do with a diary written by a dummy? Do you read it? Billy has to figure out that answer fast. But Slappy's diary isn't just daily thoughts and feelings. There are clues that lead to something special. Is Billy brave enough to follow Slappy's darkest secrets?