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.

Traveling through Europe to destinations like Prague, Paris, and Rome, Batman must defeat this disease before it defeats him. The sworn enemies are forced to work together to find the cure to what ails them.

Collects Batman: Europa #1-4 of the 4-issue miniseries.

Brian Azzarello has been writing comics professionally since the mid-1990s. He is the author of JONNY DOUBLE, BATMAN: BROKEN CITY and the Harvey and Eisner Award-winning 100 BULLETS, all created in collaboration with artist Eduardo Risso. The New York Times best-selling author's other work for DC includes the titles HELLBLAZER and LOVELESS (both with Marcelo Frusin), SUPERMAN: FOR TOMORROW (with Jim Lee), JOKER and LUTHOR (both with Lee Bermejo), SGT. ROCK: BETWEEN HELL AND A HARD PLACE (with Joe Kubert), FILTHY RICH (with Victor Santos), and most recently the all-new ongoing series WONDER WOMAN (with Cliff Chiang). He also wrote the Richard Corben-illustrated graphic novels Cage and Banner for Marvel Comics. Azzarello lives in Chicago with his wife, artist Jill Thompson, and tweets only when he has something to say.