Gotham Central Book 1 - In the Line of Duty (2011)

In the shadow of the Bat.
It's not easy being a cop in Gotham City.
Not only must you deal with the violence and corruption of the world's most notoriously crime-infested city catering to some of the most insane and homicidal criminals, but you also have to deal with a vigilante who's hellbent on playing by his own rules.
Gotham's Finest work around the clock cleaning up after the mess left behind from Batman's one-man war against crime. But when one of the GCPD's own is killed by Mister Freeze, the squad is in a race against time to bring him in without the help of the Dark Knight.
Plus, Police Detective Renee Montoya is "outed" as a lesbian, and finds her work environment and personal life turned upside down. Unfortunately for her, things only become more complicated when she is kidnapped by Two-Face.
The multiple award-winning GOTHAM CENTRAL series is brought to you by acclaimed writers Ed Brubaker and Greg Rucka, with artist Michael Lark. This volume collects GOTHAM CENTRAL #1-10 and features an introduction by Lawrence Block.