President Fuentes tries to escape his tiny country to the United States, evading assassins. Seaview is assigned the task of rendezvousing with his yacht to retrieve him, but when they arrive, the ship is heeled over and deserted. Crane leads a prize crew to recover the ship, but it runs into a strange mist and Seaview loses contact. It's all part of a complex plan engineered by General d'Alverez and his Oriental sponsors to embarrass the United States. A plan that will also leave Crane and his prize crew dead unless Nelson can enter the tiny country and rescue them, against tall odds.