A riddle is left for the Batman, but it seems wrong somehow. Who's stealing the Riddler's shtick? And who's going to get to the copycat first: Batman or the Riddler?
Someone is leaving riddles for Batman and it is not the Riddler! Angry that someone is cramping his style, Nigma escapes and finds out that another inmate from Arkham was behind it all. Both are captured by Batman.