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Bob Mackay, a wealthy yachtsman, ships with Captain Duffy in search of buried treasure on the Isle of Hope. During a mutiny, the ship is set afire, and Bob is stranded on a desert isle in the company of Dorothy Duffy, the captain's daughter. They take refuge in a deserted castle and find the pirate gold. Dorothy is kidnaped by some sailors from her father's boat, and Bob rescues her. Bob and Dorothy are later rescued by some of Bob's friends and then are married at sea by a ship's captain.