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Le Rapace(Lino Ventura) is a suave soldier of fortune with a mysterious, unknown past. A group of South American revolutionaries hire him to kill a tyrannical leader. When he is caught in the middle of rival factions, he foregoes his financial reward and saves the mistress of the supposedly doomed tyrant. He finds his employers are just as vicious as the man he is sent to kill, and he turns his gun on the ones who planned the assassination, saving the life of Migel (Xavier Marc), who remains the logical choice to take over the country in the wake of massive political upheaval.