Within the millennia-old walls of the Colosseum, in the ruins of the arena where gladiators fed the sand with their blood, the identity of the mysterious foe who infected Batman and The Joker will at last be revealed. With his strength abandoning him, Batman must face a threat he may no longer be able to battle. Is Batman ready to pay the price for the cure to the Colossus virus - if it even exists? And what is the true role of The Joker in this sick game?