Julian and Claire Perry and their two children, Megan and James, have made the move to a bigger, nicer home in their city's historic district. But something isn't right.

The neighbors seem reluctant to visit. Claire can't shake the feeling that someone is watching her. Megan receives increasingly menacing and obscene texts. And James is having terrible dreams. No wonder, considering what he's seen in the corner of the basement, staring at him and shuffling closer ever so slowly.

Pity no one warned the family about the house. Now it's too late. Because the darkness at the bottom of the stairs is rising....