Phears, an evil ghost, wants eleven-year-old Max to help him capture the ghosts of two children whose parents once trapped him, and he sends a Berserker Ghoul to possess Max and convince him to obey.

Just as eleven-year-old Max is celebrating a chance to move away from the ghosts who have been ruining his life, two ghouls invade his house and only Nicky and Tara, the ghosts, can scare them away.

When his brother, Colin, takes the pendant in which the ghostly Nicky and Tara's parents may be trapped, Max must follow him to Camp Snake Lake and try to retrieve the pendant before evil ghosts find it.

Max already shares his house with two young ghosts that only he can see, but things get really bad when an evil ghost decides to share his body.