Captain Buckner receives a directive advising professional gamblers are taking men on the base for thousands of dollars a month. One man in particular from Sharkey's barracks was seen leaving a San Diego hotel where the con men are staying. The captain orders Sharkey to find who the man is. He questions to find the man to be gullible Kowalski who has lost all his money, $300, that he was going to give his mother. Sharkey vows to seek revenge on the con men and go to win back the money. The slick con man Duke (Buddy Lester) expects it, however, letting Sharkey win it back so his greed will make him come back and lose even more. Indeed, Sharkey returns for a high-stakes gambling showdown.