A hospital erupts in flames. A boat careens into a dock. Fresh corpses are found in the ruins of Arkham Asylum. These are but a few of Gotham's historical atrocities, committed in disturbing, copycat-like fashion by the foul creature known only as Memento. While the dynamic duo fails to prevent these heinous acts, the very fabric of their alliance frays and rips. Can Batman withstand losing his city to violence while losing his son to uncertainty?