9The Riddler in a bit of a slump. It's bad enough that Batman and his friends have foiled him again. But what's really got him down is that he's no closer to learning the Caped Crusader's true identity. Who is the man behind the mask? To find the answer, The Riddler hatches a precarious plan that turns Batgirl and Robin into the pawns. Can Batman stop the Prince of Puzzles before he solve the ultimate riddle? Find out in this action-packed chapter book for DC Super Hero fans