In this new collection of issues #16-21 and BATMAN: THE DARK KNIGHT ANNUAL #1, Batman discovers a trail of bodies but no leads. His detective skills are put to the test as the Mad Hatter begins kidnapping Gotham City citizens for an unknown purpose. But as The Dark Knight delves deeper into this mystery, he soon realizes that this is unlike any other Mad Hatter case. The Hatter's gory past will be revealed, and Batman's resolve will be put to the test!