A ruthless new gang of criminals known only as Nightwalkers is terrorizing Gotham, and the city's elite are being taken out one by one. On the way home from his 18th birthday party, newly minted billionaire Bruce Wayne makes an impulsive choice that puts him in their crosshairs and lands him in Arkham Asylum, the once-infamous mental hospital. There, he meets Madeleine Wallace, a brilliant killer...and Bruce's only hope. Madeleine is the mystery Bruce...
"Dr. Harleen Quinzel has a theory: mental illness is a survival mechanism. As she seeks to help the broken souls of Gotham City piece together their sanity she will become the one thing she fears the most: one of them. A bold new retelling of the tragic origin of Harley Quinn told through the eyes of the only person who knows her better than anyone: Harleen. It's been months since Harleen began interviewing criminals at Arkham Asylum, and she's having...