Soon after the Brannock family moves into their dream home, they receive a threatening letter from a mysterious sender - and suffer an unexpected loss.

After hiring a private detective, Dean speaks with a former homeowner who's still shaken by what he endured. Nora and the kids move into a motel.

The pool of suspects shrinks in the wake of neighborhood tragedy. Karen offers Nora a way out. A strange visitor tells Dean about the Fourth Turning.