The Joker Presents: A Puzzlebox

It's story time! The G.C.P.D. discover a mysterious corpse, a magical box, and a murderer's row of the city's most dangerous villains sitting in a jail cell. Now all they need to figure out is what exactly happened. Fortunately, one suspect is willing to talk. Unfortunately, it's The Joker. Now, superstar writer Matthew Rosenberg, magnificent artist Jesus Merino, and a multitude of rising-star artists invite you to spend a night in the Gotham Central interrogation room for a dozen tales of murder, mayhem, and mystery as told by the Clown Prince of Crime himself. Can you solve this puzzle before the sun comes up?