Batman gathers his forces in "Assembly," a self-contained story that represents a critical turning point in the battle to reclaim "No Man's Land," beginning with the revelation of Batgirl's true identity! The Dark Knight has alienated those who once trusted him with their lives ? Robin, Nightwing and Oracle among them. After unmasking the new Batgirl and replacing her with another mysterious heroine and summoning Azrael to his side, Batman must now regain his former allies' trust and co-ordinate their efforts if his plan to regain control of Gotham is to succeed.