World's Finest Comics (1941-) #75

When Batman is laid up with a broken leg, Superman comes to Gotham City to help Robin track down the Purple Mask Mob, but it's Batman who cracks the case.

Written By:
Bill Finger
Pencils:
George Papp, Curt Swan, Bruno Premiani
Inks:
George Papp, Stan Kaye, Ray Burnley
Cover By:
Curt Swan, Stan Kaye