Detective Comics (1937 1st Series) #624

"Bitter Victory!" Part 3 of 3. Story by John Ostrander. Art by Flint Henry (pages 1-3, 7-8, 10-13, 17, 19), Mike McKone and Jose Marzan (4-6, 9, 14-16, 18, 20-22). As a distorted version of the Caped Crusader meets his end in a comic strip, the real Batman hunts down a psychotic imposter