The story follows 8-year-old Jenny, who is haunted by the feud between her lawyer mom, Maggie, and artist dad, Jeff. She leads a lonely but imaginative life, surrounded by a group of puppets called "Scary Relatives" based on her father's work. When Maggie is tragically killed in a hit-and-run, Jeff and Jenny try to start a new life. But when Maggie's father sues for custody and the babysitter Samantha attempts to become the new mistress of the family, their country cottage in Brooklyn takes a dark turn. The terrifying puppets come to life, and Jenny is the only one who can see them. As the motives of these terrifying creatures become clear, everyone's life is in very real danger...