Detective Comics #845 DC comic book. Written by Paul Dini, Art by Dustin Nguyen & Derek Fridolfs, Cover by Nguyen. A killer stalks the city, taxing the wits of Batman, the Riddler and every other detective in Gotham. The Dark Knight's quest to unravel the truth behind the seemingly unrelated murders is complicated by the surprise return of a fan-favorite character. What sinister secret lies at the bottom of the gruesome murders plaguing Gotham City?