When a young woman named Alice moves to a new city, she learns about a series of disappearances that may be connected to a baffling rumor about mysterious staircases in the city's worst neighborhoods.

Alice treads the line between reality and madness as she becomes more deeply entangled with the Peach family and their dark history; Zoe begins to behave strangely following her unexplained return to Garrett.

Alice has a terrifying encounter in an abandoned hospital; Luke, Louise and Nathan play cat-and-mouse with Robert Peach.

Alice confronts her own incipient madness while Zoe eats with the Peaches.

Zoe discovers there's something else living in the summer house; Alice reaches the point of no return.