Les amours de Paris focuses on three disparate couples and their problems in the arena of romantic love. One couple is comprised of a faithful husband and a sick wife whose stay in the hospital is not so bad because she has taken a sudden interest in her doctor. In the second pairing, a womanizer comes to see that the model who is in love with him is worth more than yet another conquest. And to complete the trio, two zany people finally realize they are a couple.

Bernard Sommet has killed his wife and her lover and he declares that was a crime of passion. Sylvie Foucot, his court-appointed attorney, not only believes him but falls in love with him. But the examination magistrate is not convinced. For his part, he leans towards premeditation. Whether Sommet premeditated his act or acted out of anger and jealousy will be up to the court to decide.