"When Batman discovers a mysterious package containing DNA test results proving that he is not Damian Wayne's biological father, the Dark Knight sets his sights on his son's true father--Deathstroke! But Damian Wayne can't really be Slade Wilson's son--can he? And who sent the package--and why? The ultimate custody battle ensues as the World's Greatest Detective and the World's Deadliest Assassin clash in this instant classic!"--