Suzanne Mathis is a psychiatrist who decides to shelter a fragile young girl named Mae to protect her from the cult she escaped from. The hope is that Mae can fit in her three daughters at home, but before long a series of incidents — seemingly brought on by Mae's presence — leaves the family in chaos.

One of Suzanne's daughters suspects that there could be more to the mysterious girl's past, so they work to unravel her story and the sinister happenings in the town from which she escaped.

Adapted from the bestselling novel by Daria Polatin.