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Roberto La Rocca (Jean-Paul Belmondo) is an ex-gangster whose friend Xavier (Pierre Vaneck) has been unjustly thrown in prison. Indeed, local gang leader Villanova is the one who framed Xavier. La Rocca confronts the mobster and kills him. Later, while helping his mistress (Beatrice Altariba) to fight off an American gang of racketeers, Roberto is caught by the police and is put in the same prison with Xavier. Then the two volunteer to clear land mines left from the last war, hoping to receive a pardon and to buy a quiet farm. The same novel by José Giovanni was later filmed by the author himself as La Scoumoune, again starring Belmondo.