Josh Ladd noticed some suspicious actions by two men even before they all boarded a ship for a cruise down the Pacific Coast to Baja California. But even Josh missed seeing one man slip something into his luggage. This sets up a shipboard mystery which is complicated because the school bully is also on the same ship.

Josh and Tank decide to solve the mystery but their investigation unknowingly entangles them in a smuggling operation that threatens world peace. In a race against time, can Josh solve the mystery before the unknown adversary reclaims his secret item from Josh’s bag and makes an unusual escape from a ship at sea?