When a beautiful young woman in the South of France is stalked and then assaulted by a mysterious masked assailant, she kills the man in self-defense, and in a moment of misjudgment, dumps his corpse over a cliff into the sea instead of calling the police. Trying to return to her life before the attack, her world is turned upside down when an American investigator shows up and, to her horror, seems to know everything about what she has done.