Batman (1940) #623 (ONLINE ORDER ONLY)

Part 4 of the 6-part "Broken City" by the creative team of 100 BULLETS.  

The mystery surrounding the killer of a boy's parents deepens as Batman viciously tears into the stoolies and criminals of Gotham City for answers.  But the bad guys have two bombs of their own to drop on the Dark Knight: Little Boy and Fat Man, two destructive new villains who've already proven they're tougher than Gotham's guardian.