When a high school senior discovers her teacher is seducing her boyfriend, events turn deadly after the teacher tries to cover it up.

Samantha and daughter Blake invite Chloe, a foreign exchange student from Britain, into their California home. The two girls become close friends but Samantha’s uneasiness begins with the suspicious death of Blake’s boyfriend. Samantha sets out to prove her daughter’s innocence, discovering Chloe’s ultimate plan is to “adopt” Samantha as her “mum”.