“Secrets of a Stranger!”
The Flash decides to take on a case involving a mysterious stranger, who has caused the deaths of two people, when the "Clue Sleuth", billed the world's greatest detective, refuses to investigate.
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All-Flash #15 (1941) is issue #15 of DC's All-Flash (1941–1947), with a cover date of July 1944. Written by Gardner Fox and Ed Wheelan and drawn by Martin Naydel and Ed Wheelan.
Credits, characters and story details from the Grand Comics Database, CC BY-SA 4.0.