Every time he thinks he's out, they pull him back in - the Pied Piper, that is! As if Piper weren't in enough trouble already, the Joker's venomous plans strike Keystone City, transforming one of the Flash's greatest allies into a lethal, laughing Rogue! Plus, Iron Heights is under siege and a "Jokerized" Deadshot sets his sights on Captain Boomerang!
Deadline, Merlyn and Deadshot are coming to Keystone with smiles on their faces. The Flash must stop them from killing themselves and everyone around them as well.