 Captain Biff Brown (Richard Lane) owns a boat used to ferry prisoners from the mainland to Alcatraz. The police find some escape tools on his boat and, although Brown isn t involved, his contract is terminated and he goes back to tuna fishing. Brown takes his friend Sanderson (William Bishop) to his boarding house and introduces him to his sweetheart Madge Harris (Louise Campbell) and Sanderson also falls in love with her. A gang headed by Red Mason (Damian O Flynn) and trying to escape the country bribe Brown s engineer, Venatti (Anthony Caruso), and are hiding on the boat the next time Brown and Sanderson take it out. They take over the boat but a storm is approaching...