Mortal Prey by John Sandford

Years ago, Lucas Davenport almost died at the hands of Clara Rinker, a soft spoken Southern beauty, and one of the FBI's most wanted killers. Now, they're crossing paths again--on an interstate revenge spree triggered by a sniper's bullet that robbed Clara of her lover and her unborn baby. With nothing left to lose, she can only be stopped by Davenport--or count him among her victims...

I love these books, especially when they have a continuing thread from a previous book.

Clara Rinker is back and she's after revenge. She had escaped to Cancun where she started over with a new identity. She met a guy and fell in love and was expecting a baby. She was happy until one day a sniper shot at her and hit her lover instead. She was wounded and lost her baby. Her lover just happened to be the son of a well known and feared drug lord. Heads were going to roll... Clara made some calls and had a list of names of people who wanted her dead. The FBI had to try to get to them before she did but their main goal was to catch her and stop her from killing more people. They decided to call in Lucas Davenport since he had helped them the last time. He also seemed to have luck on his side. Unfortunately, not everyone working the case would be so lucky.

Really enjoyed this one. It's a continuation of Certain Prey and it's really a good cat and mouse story with a surprising ending I did not see coming.