While on a late-night road trip home, a mother must save her daughter from a bizarre cult obsessed with blood-letting and cars. Senga and her daughter Nat are returning from a visit to the girl's father for her fifteenth birthday. Nat meets a backpacker at a roadside diner, and after an argument with her mother, joins the backpacker in a weird couple's motorhome. Senga is attacked, and must follow the cultists to an abandoned research facility where Nat is about to be initiated.