The inmates of Arkham Asylum have taken over DETECTIVE COMICS in "Beneath the Mask" Part 1 of 2! It's Black Mask verses Jeremiah Arkham for control of the asylum. But what of the enigmatic Three Beauties, and how does Batman fit into the mad plan? Everything that was set up and teased in BATTLE FOR THE COWL: ARKHAM ASYLUM and ARKHAM REBORN is at last revealed, but the answers to the mysteries just might drive everyone – including Batman – mad!

Then, in the co-feature, the spotlight is shone on Renee's personal life. But just who knows about her secret identity, and what will they do with that information? That is the question...