While doing a friend a favor and searching for a runaway teenager, a police detective stumbles upon a bizarre band of criminals about to pull off a bank robbery.

When her husband is hospitalized after a car accident, EMT Karen decides to rent out their spare rooms online. All goes well until Miranda moves in. Miranda quickly infiltrates all areas of Karen’s life. When one of Karen’s renters is found murdered, Karen becomes convinced Miranda was involved but has no idea that kicking her psychotic guest out will send Miranda into a murderous rage.