DC Multiverse - Beneath the Mask - Black Mask as Batman

In "Beneath the Mask" the inmates of Arkham Asylum have taken over!

It's Black Mask versus Jeremiah Arkham for control of the asylum. But what of the enigmatic Three Beauties, and how does Batman fit into the mad plan?

Batman spends the night in the bowels of Arkham Asylum attempting to uncover its mysteries. Plus, the horrifying fate of Black Mask is at last revealed!