After defeating Ultrawoman and Parasyte alongside Superman, Supergirl, Wonder Woman, and the Flash, Bruce Wayne and Dick Grayson now find themselves tangled up in a mystery that they must uncover. Pamela Isley, one of the most prominent doctors at Arkham Asylum, has gone missing in the event of a most recent riot at the prison that also resulted in the death of Police Commissioner Harvey Bullock. Along with Pamela's disappearance, Bruce discovers that both Slade Wilson and Thomas Elliott are also missing. Now, it is up to Batman and Robin to discover the truth behind Pamela's absence, not knowing that something dark is about to happen soon enough..
