After a young Penny Dearborn lost her parents in a tragic auto accident in the snowy mountains outside of Los Angeles, she developed an acute fear of cars. Eleven years later it still traumatises and haunts her. Determined to overcome her fear, Penny has been undergoing therapy with Orianna Volker, a psychologist who specialises in helping people conquer their worst fears. After months of therapy Penny accompanies Orianna for the final stage of her treatment: an automobile trip back to the mountains, the site of the original accident. Their journey takes them deep into the mountains with a snowstorm headed their way. With night falling, a mishap with a mysterious hitch hiker on a lonely stretch of highway causes an abrupt detour into a living nightmare of madness, murder and a horrific life and death struggle with a ruthless, cold blooded adversary bent on preying upon Penny's worst fe­ars.