Screen legend Cary Grant stars as a gangster trying to put his troubled past behind him in Gambling Ship. Weary Chicago racketeer Ace Corbin (Grant) and Eleanor La Velle (Benita Hume), the mistress of infamous gambling ship operator Joe Burke (Arthur Vinton), put their troubled pasts behind on a train bound to New York. With their true identities concealed, the two fall madly in love. A disastrous combination results when Ace makes efforts to purchase the debt-ridden gambling ship from Joe and steals the gambling trade of his old enemy and gangster Pete Manning (Jack La Rue).