Young Jeanne falls in love with photographer Francis, who soon takes her with him when he emigrates to America. In a small town in the still wild west, they build up a small photo shop. Meanwhile, animal doctor David lives on his lonesome farm together with his unlucky wife. It takes years and two tragic accidents until Jeanne and David meet. She has already decided to return to France as soon as possible, but love, and fate, have other plans.

Ship engineer Jim Taggert is rescued from a torpedoed tramp steamer by Joe Morgan, an American gangster that found New York too hot for him, and has become a fisherman operating from an out-of-the-way island off of the coast of South America. Morgan makes his headquarters at the Halfway House run by the parents of Maria Styx as a bar and dance resort catering to the planters and traders of the island. Taggert finds himself practically a prisoner along with a group of American girls acting as entertainers at the resort. Taggert shadows Morgan in his activities in a remote cove and finds that Morgan is supplying German U-boat commanders with torpedoes, but does not know that Morgan has rigged the torpedoes with clock devices that explode when at sea and sinks the U-boats.