A very interesting plot of the film based on the novel "Waltz into Darkness" of the writer Cornell Woolrich. It is a drama rather than a film noir, which tries to send a message that love changes your own life, i.e. your love to any person and the love you received from him/her. A wealthy man really changed his life for love, while his partner finally understood that he was the only one that loved her. Belmondo played well as usual, while a somewhat still young Michel Bouquet played his eternal role of a detective or police agent. Frankly Bouquet was not so impressive in this film, but less than that was the performance of Catherine Deneuve. She was not so convincingly in her role as a prostitute then lover/wife of Louis Mahé (Belmondo). For those who like to visit the world, the film offers the occasion to see part of the Ascension Island, and also Lyon city in France.