Sandro finds Riri who is a perfect double for Laura. Yet, Riri is a professional love-maker and Sandro possesses her. Meanwhile, he goes back to Laura and resumes all his previous sexual attraction for her. A terrible suspect arises in Sandro's mind: Riri might be Laura in a disguise. Laura might have token advantage of her living alone to play a trick on her husband. That suspect obsesses him while he leads two parallels relationships. Riri is becoming a nice housewife while Laura has started acting as a prostitute. One the one side, Sandro would like to solve the riddle, but on the other hand, he is afraid by the terrible discovery. Are they really two women in one? No they are not. The day comes when Sandro goes to Riri's empty house, phones Laura and Riri reaches him in five minutes time. Much too short to walk from one hou-se to the other. But soon after, he discovers a private passage that links the two houses in a five minutes walk. One day he phones Riri, scours the tiny passage and, once in front of Riri's door finds a crying Laura waiting for him. "Either you choose Riri or me. You have no other choice", she tells him. Now, Sandro could climb the stairs and see if Riri is inside. But Laura walks off. Looking al her figure from a distance, Sandro is hesitating. Finally, he reaches her and comes back to their house.