Upon finding a far-flung South Seas island run by thugs, Capt. Jim Knight (Jon Hall) rounds up the baddies and plans to take them to trial. But en route to the mainland, Knight's cache of criminals stages an elaborate takeover (led by John Carradine). The dutiful Knight fights valiantly to save his ship, but saving himself is another matter. Watch for Peter Lorre in a brief turn as a corrupt magistrate in this spirited adventure.