When fifteen-year-old Jules Mathis comes home from school to find a strange girl sitting in her kitchen, her psychiatrist mother reveals that Mae is one of her patients at the hospital and will be staying with their family for a few days. But soon Mae is wearing Jules s clothes, sleeping in her bedroom, edging her out of her position on the school paper, and flirting with Jules s crush. And Mae has no intention of leaving.

Then things get weird: Jules discovers that Mae is a survivor of the strange cult that s embedded in a nearby town.

And the cult will stop at nothing to get Mae back.