GUEST-STARRING GREEN ARROW AND BLACK CANARY! Whistleblowers against a giant corporation are dropping dead in Gotham. While no evidence of foul play has been found, something doesn't feel right to the city's Dark Knight. Luckily, Black Canary and Gotham's newest resident, Green Arrow, are here to help. But the investigation takes a detour when a mysterious teenage girl stumbles into their path. Even more concerning are the grave and terrifying implications about the girl's connections to Bruce, Dinah, and Oliver's shared history. Can Batman protect the last whistleblower long enough to uncover who is behind this murderous plot and stop them? Will this trio be enough to find this girl and unravel the mystery of her past? Collects DETECTIVE COMICS #1107-1112.