For years, Batman has protected Gotham City. In the process, his crusade has inspired imitators, proteges, and arch-enemies. But very recently, Bruce Wayne has been murdered, leaving Gotham without a Batman, and his proteges with the most difficult challenge they've ever faced: protecting the city without him.

Now, a serial killer is on the loose, targeting the actors and crew of a movie filming in Gotham. Who is the killer, and why are his victims wearing clay masks?