Diary of a Dummy (Goosebumps Slappyworld #10)

The story follows siblings Maggie and Billy McGee as they discover an abandoned ventriloquist dummy named Slappy, which they unwittingly bring to life. Their excitement quickly turns to horror as they face the malevolent dummy and other frightening challenges. As they navigate this terrifying adventure, the siblings uncover Slappy's diary, which hints at hidden treasure, leading them on a quest to find a second diary while evading Slappy's sinister antics.