Maria - Nur die Nacht war ihr Zeuge (1976)

Lucia, a young German married to Paolo, a Neapolitan emigrant, is raped. She tells a lie to her husband, but the day he discovers the truth a tragedy begins for the woman, leading her to suicide. Paul is destroyed: he seeks revenge. He takes his diving gun and enters the room where the man who raped his woman is having a toast with his friends.