Submarine Base

"In this wartime drama, an ex-gangster proves himself a decent man when he helps defeat the Nazis while he is hiding out on a tiny island. At first the gangster looks as if he has joined the German soldiers by providing them with a location for refueling their U-boats. Later an American ship is sunk off shore. Among the survivors is a merchant marine who was formerly a New York City cop. The cop instantly recognizes the fugitive mobster and the situation soon becomes tense. In the end the Nazis realize that he has been working for the Allies all along and he is executed."