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The Isle of Lost Men is one of those lawless tropical island colonies so beloved of adventure-story writers. It is here that kidnapped Australia damsel Alma Fairfax (Patsy O'Leary) is brought by no-good Captain Jan Jadohl (Tom Santschi). Meanwhile, on another part of the island, virtuous young David Carlisle (Allen Connor) is searching for a fortune in lost rubies. Jadohl and his scurvy companions temporarily shelve their dishonorable intentions towards Alma to join in the treasure hunt, intending to bump off David once the gems have been recovered. But David not only thwarts the villains but also rescues the heroine.