Major Thorpe (writer and artist), Mort Leav (pencils)
Published in Jumbo Comics #41, Jul 1942 - 7 pagesZX-5's Chief decides that his star agent is in much need of a vacation. ZX-5 decides a trip to Florida is in order. In the airport there he helps a young woman who dropped her belongings. She forgets a small book which ZX-5 reads and learns she is a foreign spy deserving watching. She and her gang are out to destroy a US aircraft carrier.
Here are the pages I have of it.