From the Back Cover
Pierre Gilieth (Jean Gabin) kills a man after a violent argument and must flee Paris. He finds sanctuary in Barcelona, Spain but while there, his wallet is stolen. Destitute and to the point of no recourse, Pierre decides to join the Spanish Foreign Legion. Two other Frenchmen, Mulat and Lucas, who are also joining at the same time befriend Pierre. He tries to forget the violent act that caused him to flee his home but one day, one of his newfound friends drops an identity card in front of Pierre with disturbing consequences.