Absolute Batman. Vol. 3. Devil's workshop

"Batman won his explosive battle with Bane, but his friends will never be the same--and he might not be able to help them, even if he crosses worlds and enlists the help of a god to do it. Meanwhile, another of Ark M's residents will be unleashed on Gotham. And the biggest question of all still remains...what is the true identity of the man behind everything? Legendary artist Jock reunites with writer Scott Snyder to tell one version of the story Alfred's been chasing for years, and a one-shot explores the origins of Ark M!"-- Provided by publisher.