Batman: Europa (2015-) #4 (NOOK Comic with Zoom View)

As they reel from the effects of the Colossus virus, Batman and The Joker make their final stand in the ruins of Rome’s Coliseum. At last, their true enemy reveals his identity for one final showdown. Weakened by sickness and forced into an uneasy alliance with his greatest foe, how can Batman focus on what he needs to do to survive?