Diana Lane is the mistress of multimillionaire Paul Riverdi. For six months now she has been accompanying him to all receptions and presentations, sharing hot nights with him, but... by morning she invariably disappears. Paul knows absolutely nothing about her life. Suddenly Diana declares that everything is over between them and leaves. Humiliated, enraged, having not outlived his passion, Paul decides to take revenge. He hires a private detective to find out everything about Diana, to find her weak point. And he finds it. But the thirst for revenge is soon replaced by a completely different feeling...