"Alone"

"Alone" is authored by Lisa Gardner and is the first, I believe, of her Detective D. D. Warren novels.
D. D. Warren is part of a team investigating a shooting by Sniper State Trooper Bobby Dodge.  It would seem straightforward when a sniper team is called to a home in a wealthy neighborhood that has been the site of previous domestic disturbance calls.  Gunshots were heard and Dodge doesn't hesitate when he sees the husband aiming a gun at his wife and son and the look on his face informs Dodge he's about to pull the trigger.

Although it seems like a kill shot that needed to be taken, things are complicated by the fact that the victim is the son of a prominent judge who vows to see Dodge tried for murder.  The victim's wife is accused of child abuse because the son has been ill most of his life so the grandparents want custody.

In addition the victim's wife was the victim of a child abduction as a young girl and the perpetrator has just been released from jail and she was not informed.  When people around her begin to die, she turns to Bobby Dodge which makes D. D. Warren suspect they had a relationship prior to the shooting.  It's a great novel full of twists and turns!  pazt