Gotham Central Book 3: On the Freak Beat — Greg Rucka

This volume collects two separate cases of the Gotham Special Crimes Unit. Detective Renee Montoya investigates the disappearance of important evidence amid a gang war and travels to Keystone City in an attempt to unveil the truth about Officer Kelly's strange mutation. Plus, the dead body of Robin, the Boy Wonder is found on the streets. Now the detectives of Gotham Central must try to solve the mystery of his death while dealing with his former associates, Batman and the Teen Titans!