As the Batman resumes his search for Rupert Thorne, his investigation intersects with that of Carrie Kelley, an amateur detective calling herself "The Crime Smasher"! Together, they team up to take down Gotham's underworld fixer, Mr. Zero!

It's Judgement Day in Gotham when a contagion spreads across the city, turning citizens into homicidal maniacs. As survivors cower in fear, the Batman's allies mobilize to save whoever is left while the Dark Knight Detective finally faces his ultimate foe, The Joker!