Indrajal Comics #47

In a story frame, The Phantom tells Diana of how one of his ancestors became ill. Fearing that the Phantom's absence would threaten jungle peace, his twin sister Julie took his place very successfully, but at last crooks discovered that she was \"only\" a girl. They tracked her to the Deep Woods and made away with some of the Phantom treasure. She recovers the treasure, but the crooks lose their lives in a waterfall through rejecting her instructions. Her brother never realizes her ruse.