In San Francisco, the sportsman Kay Hoog tells to the members of a club that he has found a message in a bottle with a map from a Harvard's missing professor telling about a treasure of an Inca lost civilization still alive. He decides to go to Peru to seek the gold. However, members of the secret criminal organization The Spiders leaded by Lio Sha break in Kay's mansion during the night and steal the map. Kay Hoog travels to Peru, where he retrieves his map and a document about the Diamond Ship from The Spiders. Later he saves the Priestess of the Sun Naela and brings her to San Francisco. However, The Spiders kill Naela and Kay Hoog promises revenge for the death of his love
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