As Dominique Marceau is being tried for the murder of Gilbert Tellier, accounts by different witnesses paint a picture of the kind of relationship the two used to share.
Three little criminals get a tip for a great coup with lots of money in it. Unfortunately they lack the starting funds to buy the required welding torch. So they persuade their successful colleague Alphonse to join their team. But the well thought-out coup fails, and Alphonse is the only one of them who ends up in jail for several years. When he's released, he's out for revenge.
Young, handsome, dashing but cynical, Octave Mouret arrives in Paris, determined to conquer the belles of the capital.