Detective Comics #1091

A BRAND-NEW VILLAIN STALKS THE STREETS OF GOTHAM CITY! When we last left Bruce Wayne he was offered a mysterious youth serum, known only as Sangraal, that promises to rejuvenate his body and mind--making him as strong and nimble as he once was. But can he possibly accept this strange gift? Meanwhile, the sinister, scalpel-fingered villain known as Asema stalks the shadows of Gotham, slaying small-time criminals with surgical accuracy. But what is the purpose of these murders, and how do they concern the Dark Knight?