City of Windows by Robert Pobi

Lucas Page used to be an FBI agent but after catastrophe struck and he returned to the land of the living a few parts short, he decided to give it up and become an academic. He was settling into his Professor role until a sniper started picking off law enforcement officers and others in NYC. And, just like that, he was called back in to do what only he can figure out. This is a heart-pounding police thriller with a grouchy but thoroughly loveable character. The story is complex and makes you figure out the clues instead of handing you the bad guy. Violent and scary and probably a little too realistic but wow, what a great read. Anyone looking for that next hit of adrenaline will want this.