This is master-piece, one of the best movies I've ever seen. Belmondo is excellent, and Tcheky Karyo, of course. Music of Ennio Morricone is so beautiful that you can't describe it (it reminds me on music in movie "Frantic" by Polanski, where Morricone also made music). This one of the best detective movies, ever shoot in the world cinematography, of course with "The French Connection". You have to watch it.