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"Jack el Negro" es un barco cuyo capitán es un contrabandista que, harto de ser perseguido por la marina española, está deseando dejar su oficio. Un día, el barco recoge a un grupo de refugiados políticos cuyo navío ha naufragado. Entre los pasajeros está la bella Ingrid, que se enamora del capitán.
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René Sabin, engineer, disappointed by failures, leaves his village in the South to go to Paris with friends. In the capital, he befriends dubious people, in particular Alex Krakow who does not disdain shady business. Then comes the war. René is mobilized then returns to the country, and finds with joy his fiancée.