When Bryce and Jackie, the twins of the Joker and Harley Quinn fled into a stolen Batmobile, only Jack Napier's hologram, has a hope of bringing them home safe and sound and keeping them away from the seids of the Joker. But crime is not the only temptation they will face: the children discover a secret that could bring their father back to life for good! Will they get to revive the greatest enemy of the Black Knight?