A #1 New York Times Best Seller! Kyle Higgins sends Nightwing to the Windy City to track down his parent's killer! After the Joker's attack on the Bat-family, Nightwing finds himself in a new setting with an unlikely ally, The Prankster. Together they are being hunted by the mysterious Mask Killer while Dick tries to find the man who killed his parents, Tony Zullo. Twists and surprises are at every turn in this exciting new chapter of Nightwing! This volume collects Nightwing #19-24