German spy Freya Talberg (Alice Terry) seduces Spanish sea captain Ulysses Farragut (Antonio Moreno) to use his neutral ship, the "Mare Nostrum," to transport supplies to a German submarine. Freya assures Ulysses the submarine will respect neutrality, but soon after, the sub sinks a ship carrying Ulysses' son. Grief-stricken and bitter, Ulysses offers his ship to the French to pursue the Germans -- while Freya, guilty over her involvement with the sinking, tries to withdraw from spying.
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