Kay Hoog finds a message that indicates that some Incas are still alive, but the secret organization "Die Spinnen" wants the Incas' gold...
A desperate, haggard-looking man puts a message into a bottle, and is able to throw it into the sea just as he is shot by an arrow. Some time later, well-known sportsman Kay Hoog announces to a large audience that he has found the message, which tells of a lost civilization that possesses an immense treasure. Hoog immediately plans an expedition to find it. But Lio Sha, the head of a criminal organization known as the Spiders, plans her own expedition, and she is determined to get the treasure for herself.