Once again, many years since their last case together, Bertram Lynch is joined on an adventure with his old friend, Professor Deane. This time the pair are on a very fancy yacht belonging to a global financial powerhouse (and possible arms dealer) named Viggo Sand. They are ostensibly helping in the search for pirate stolen treasure. The treasure is for real and the stolen part accurate but the guilt resides on the Nazis before and during WWII.