World's Finest Comics #2

In "The Unknown X," the newly appointed District Attorney of Gotham City becomes a target after publicly threatening to dismantle the city’s criminal underworld—claiming he holds a secret ledger of every crime lord’s name and ties. With the DA’s life in danger and the city’s underworld closing in, Batman and Robin race to protect him, uncovering a conspiracy that stretches far beyond the black book. Written by Bill Finger and illustrated by Bob Kane, with inks by George Roussos and lettering by Roussos, this 1941 classic features a cover by Fred Ray.