Join with a rather unorthodox captain of a gas tanker about to arrive in Mexico, where those not involved in cargo handling were sent ashore to buy all the things needed for his antipiracy protection. Keeping a secret of just how much money he has in his safe, he was about to get another ship free after being hijacked. Going to a port that doesn't actually exist and realizing that this was an attempt at hijacking his ship, he foils it. The voyage continues with more adventures on the way, including terrorism, finding precious stones, diverting to assist a ship in distress, and having more adventures in a port in Brazil. All the time, he has three stowaways on board and, eventually, more passengers, including the ship's owner.