Written by Rubimor (pens and inks)
Released 05/1943
From National Comics #32 - 9 pages - Case #6 - A Japanese submarine sinks the cargo ship Don Leash is returning to the States on. He is adrift but comes upon a deserted enemy destroyer and finds that secret agent Cantow Poppy is the only living passenger. Things heat up afterwards.
Here are the pages I have of it.