Agents West and Gordon report to Admiral Agnow's San Francisco headquarters, only to find him and three officers dead. The agents believe that the admiral's death ties in with the recent mysterious sinking of the cruiser Youngstown. West and Gordon's next assignment is to guard the Hawaiian king, due to arrive secretly by ship. West encounters Barclay, a Chinese expert on Hawaii, to discuss the king's upcoming visit. But the supposed advisor drugs the agent and announces his plan to sink the ship carrying the Hawaiian king.