The Hook(Το Αγκίστρι)

An adulterous woman (Barbara Bouchet) and her lover (Bob Behling) plot to murder her husband Kostas (Günther Stoll) and make it look like a yachting accident. However, unknown to them, Kostas has hired a private detective to follow them and knows of their plans in advance. A deadly game of double-crossing begins and propels all three of them towards tragedy.