In the tradition of Crisis on Infinite Earths and Kingdom Come comes a murder mystery that will shake the foundations of everything you thought you knew about superheroes! When Elongated Man's wife is found murdered in the Justice League of America Watchtower, a secret is uncovered which could destroy the entire JLA - if some of their most powerful foes don't destroy them first! Superman, Batman, the Flash, and a host of other heroes must race to discover the killer...for it seems that their own friends and family are also under threat! Who will live? Who will die? And which heroes are implicated in the darkest secret of all?