Thanks for the info, will check out the film..I did for get to mention that at the end of the film the grifter takes the gendarme out on "his" boat right before he puts in dry  dock.  As  the boat is being pulled out of the water, you hear the grifter screaming because when he killed the wealthy man and threw  him overboard, he forgot to cut the rope, so, there is the dead man's body.  If that is the way it ends, it is indeed the movie.  Thanks again!