Key To Nowhere — Robert L. Bailey

Jay Sand moves to a small city in Nebraska looking forward to his new job in the district attorney's office. He soon becomes the target of assassins and Sergeant Cindy Jackson is assigned to work out of his office and watch his back.
They stumble onto a multiple homicide in progress and are caught up in the search for the killers.
The pursuit takes them from a gun battle on the streets of Omaha to a jail break in Harrisburg as they stay one step ahead of organized crime and an intelligence spook gone bad.
This is a story of contemporary fiction about two professional crime fighters, their families, their peers and their opponents. It is also about their failures and their successes.