There's a new knight in town! Gotham is in chaos. Criminal organizations are in crisis after the death of the Joker. But Scarecrow threatens to spray the city with a special toxin that will kill thousands of its inhabitants, and plans to unite supervillains to destroy Batman once and for all. Batman tries to stop the madman. But a new figure intervenes in their confrontation - the mysterious Arkham Knight, who knows everything about Batman and his allies...