Published in Detective Comics #32, October, 1939, 6 pages.
Sabotage aboard the American submarine, H-21, results in the loss of the vessel and some of the crew. Bart Regan is assigned the task of learning who was behind it. His first clue was the desertion of a man of Metorian descent, that nation being one that "nurses no love for the U.S." This turns out to be the first step in a plan to cripple the Navy to make it easier to attack the U.S.