A brilliant inventor, Professor Roch, is on the verge of discovering a substance that could destroy the world in the wrong hands. And such hands are the hands of Count Artigas, a mysterious and dark adventurer who plies the world's seas in his submarine, sinking ships and using the riches he seizes as a tool to take over the world.
Artigas kidnaps Professor Roche from the sanatorium and forces him to complete the invention at his mansion in the crater of the Back Cup volcano. Coincidentally, Artigas also kidnaps the professor's assistant, Engineer Hart, who is also the narrator of the story, and who tries his best to free the professor and prevent his destruction.
Hart eventually sends a balloon down the volcano's mouth with a message to humanity, which is united and whose war fleets will prevent the destruction at the twelfth hour...
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