Between Superman, Nightwing, and Batman you might think the only thing they have in common is their Superhero status. But after a strange night, they find out something else... a girl, a very young girl, claiming to be the daughter of the Bat. After her comes another, and a cat. The three join the team, but a disappearance and uncontrolled destruction turn Superman and Nightwing into allies against one very young girl. Can the daughter of Batman survive? Or will Superman finally kill?