Sniper’s Nest by C. M. Sutter

The ambush is in place, he takes aim, and shots ring out. Chicago is officially on notice, and a siege is underway on the city’s men and women in blue.
Detective Jesse McCord takes on the case and he soon realizes that he and the sniper have much more in common than anyone could have known. A dangerous game of cat and mouse begins. Taking on the killer face-to-face, and single-handedly, is the only way Jesse can protect his colleagues and end the attack on his beloved Chicago—the city he calls home.