The maritime commission is being confronted with a vital problem. In the past three months, there have been eighteen ships mysteriously sunken on the high seas - ships belonging to the United States, Great Britain, Germany, Italy, Japan - every major power! This series of unexplainable marine disasters has created a panic throughout the nautical world, with passenger reservations being canceled, freight shipments are being withdrawn and crews are deserting the ships. Something has got to be done! Lamont believes it is the work of a pirate in a submarine...