Tainted Treasure – With the treasure cache secured, now engaged to the Swedish cook, Osa, Harry Martin awaits the departure of the Swedish ship, Otto J. Nurad, from Tsingtao. But plans change: four American seamen the Communists want out of China join the crew. Trouble with the four erupts soon after with Harry and the Captain thrown overboard. Bobbing about in a small raft, Harry and the Captain bump into a large disabled yacht. They come to the rescue of a billionaire and his young blonde wife, fight off pirates, and get the yacht running, hoping to overtake the Nurad.