Gun Machine by Warren Ellis
Detective John Tallow is the most unpopular man in his precinct. While responding to a call on Pearl Street everything goes horribly wrong very quickly. His partner, a beloved detective, is shot dead, and a stray blast from the perp’s shotgun opens a hole in the wall of Apartment 3A. Tallow just had to look inside. Inside, arranged in intricate patterns on the walls and floor are guns. All types: Rugers, flintlocks, Glocks, you name it. It is a CSU nightmare that only gets worse. Every gun has been used to murder someone in New York City over the last 20 years. Every one of those murders is unsolved.
If you are a regular serial killer thriller reader and want something different – here it is. It is set in the near future, but that’s only apparent when technology is brought up (private security firms using very nifty surveillance gear). Otherwise it is a game of cat and mouse and the way the guns each fit their crimes, and the way the gun machine is being assembled and why, is something you would expect from the mind that created the graphic novel RED which became the movie starring Bruce Willis and Helen Mirren.