It appears that being a schizophrenic psychopath does have its advantages. 
Detective Comics #864 is an issue of the series Detective Comics (Volume 1) with a cover date of June, 2010.
Synopsis for Batman: "Beneath the Mask Part One"
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!
Appearing in Batman: "Beneath the Mask Part One"
Featured Characters:
- Batman (Dick Grayson) (Flashback and main story)
Supporting Characters:
Antagonists:
- Black Mask (Flashback and main story)
- Hugo Strange (Flashback and main story)
- The Mortician
Other Characters:
- Bruce Wayne (Flashback only) (Cameo)
- Catwoman (Flashback only) (Cameo)
- Conrad "Mr. Midas" LeBlanc (First appearance)
- Fright (Flashback only)
- Hamburger Lady (As an illusion only)
- Mirror Man (As an illusion only)
- No-Face (As an illusion only) (Final appearance)
- Robin (Flashback only) (Cameo)
Locations:
Items:
Vehicles:
Synopsis for The Question: "Pipeline, Chapter Two, Part Six"
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...
Appearing in The Question: "Pipeline, Chapter Two, Part Six"
Featured Characters:
- The Question (Flashback and main story)
Supporting Characters:
Antagonists:
- Vandal Savage (Flashback and main story)
Other Characters:
- Batwoman (Flashback only)
Locations:
Items:
Vehicles:
Notes
- "Beneath the Mask, Part One" is reprinted in Batman: Arkham Reborn.
- David Hine's run as writer on Detective Comics begins with this issue.
Trivia
- This issue flashbacks to the brief time Hugo Strange impersonated Batman in Transference.[1]