Alex Kelsey, a lawyer involved with mobster Din Lee, kills a dying Japanese man. The dead man had been a Japanese operative at the time of Pearl Harbor. Kelsey believes the dead man had a secret stash of gold. Kazuo Tahashi, the dead man's son, arrives from San Francisco. But Tahashi isn't all what he appears to be, either. Meanwhile, in the background is retired U.S. Navy Commander Reginald Blackwell, who had been an operative in Naval intelligence. McGarrett & Co. must try to put the pieces of this jigsaw puzzle together.