One evening on a lonely country road, Hammer gives a ride to Christina (Cloris Leachman), an attractive hitchhiker wearing nothing but a trench coat. She has escaped from a mental institution. Thugs waylay them, and Hammer awakens in some unknown location where he hears Christina's screaming and being tortured to death. The thugs then push Hammer's car off a cliff with Christina's body and an unconscious Hammer inside. Hammer next awakens in a hospital with Velda by his bedside. He decides to pursue the case, for vengeance, a sense of guilt (as Christina had asked him to "remember me" if she got killed), and because "she (Christina) must be connected with something big" behind it all.