Written in Blood - Keller County Cops, #5

Detective Tripp Broussard longs to show his bad cop, ex-con father that he's a good cop, but time is running out. His father is dying. So Tripp risks his own life to go after a gruesome serial murderer-anything to prove he's a better man than his dad. Angel Saint-Martin, a blood spatter expert on loan to the department, needs her father to accept her choice of a non-traditional career, and cracking this case will show him she can handle herself in a man's world.
Driven by a common bond, Tripp and Angel band together to solve the case and put the notorious Vincent Delgado back behind bars. and along the way, they fall in love.