It's been four months since Nicky Roth has seen his best friend and neighbor, Aaron Peterson. Aaron's father, a reclusive theme park designer, told the town that Aaron and his sister Mya are living with a relative far away, but Nicky can't seem to accept it.

Plagued by terrifying nightmares of robotic mannequins, rotting theme parks, and a dark basement, Nicky teams up with his friends from school to find out what really happened to Aaron and Mya. Together, they start piecing together a picture more disturbing than they could have imagined. The screams coming from the neighbor's house can't be nothing, and Nicky is determined to get to the bottom of...