The Dead Make No Mark - Tulsa Underworld, #4

Detective Valdez will stop at nothing to bring a killer to justice-even if it means losing a part of himself. With the informant and his wife dying, the detective is in a race against time. He's in pursuit of Kade Carradine, the man who murdered the informant in a bid to keep them quiet. Valdez recruits OHP Trooper Barbara Jones, who is eager to redeem herself after Kade steals her police cruiser and causes her suspension.
Meanwhile, Kade finds his back is to a wall, and it's not just because law enforcement is closing in. After discovering his best friend plans to kill him now that the informant is out of the picture, he changes the game, acting as an agent of chaos in the ensuing power struggle with his crew. The Dead Make No Mark is an ensemble crime drama focusing on what happens after the dead are buried and the police tape has been taken down.
The end is just the beginning for Detective Valdez.