I never read the book that this movie is based on, but I suspect it contains the plot details which the movie just supplies on a whim, if at all. As a matter of fact, the movie just feels like a compilation of the book's every second chapter's climax. You'd might think this skipstone structure a major flaw, but strangely enough, you'd be wrong. This flick is a delight --the rap-atap cadence of perfunctory set-ups and upsets thrilled me to the bone. Of all of Belmondo's French gangster pictures, this is the one he should be remembered for.