Mystery Sea Raider

Mystery Sea Raider is a 1940 American drama war film directed by Edward Dmytryk and starring Carole Landis, Henry Wilcoxon and Onslow Stevens.
Plot.
A woman (Carole Landis) and a U.S. captain (Henry Wilcoxon) foil a German spy's (Onslow Stevens) plan to use their freighter to sink a British ship.