The Joker Presents: A Puzzlebox (The Joker Presents: A Puzzlebox #3)

Joker provides the GCPD with another missing piece of the puzzle involving two faces and two masks: Black Mask has travelled halfway around the world on the hunt for one of the pieces of the MASTER ENGINE, but someone is following him... someone with a gun aimed AT HIS FACE. The mystery deepens with not one but TWO double-crosses in the hunt for who killed the riddler!