Penny is a young woman traumatized by the childhood auto accident that killed her parents. As part of her therapy to overcome her fear of cars, she accompanies her therapist on a road trip back to the scene of the accident. The two women accidentally cross paths with a dark and mysterious hitchhiker on a lonely stretch of mountain highway. Soon, the attempt at healing suddenly takes a terrifying detour into a horrific life and death struggle preying upon Penny’s worst fears.