(W) Matteo Casali, Brian Azzarello (A) Jim Lee & Various (CA) Jim Lee. The impossible has happened* and Batman is on the verge of being taken down by an enemy he cannot defeat: a virus for which there is no cure! And the only hope for his salvation is The Joker! Who infected Batman* what does the Clown Prince of Crime know* and how will the Dark Knight get that information? Together* the enemies crisscross Europe* desperate to find answers before time runs out. Collects the four-issue miniseries with a new cover by Jim Lee!