Rookie Justice (Southern Justice #2)
Tori Scott

Charlie Booker is excited about her new career in law enforcement. She's recently returned from several tours of duty in Iraq, and still suffers from nightmares. But she's an expert sniper, and she can watch Cody's back just fine, thank you very much. And she doesn't mind a bit. He has a very nice backside to watch.
As they work together to fight crime and investigate a threat to the local high school, they figure out they have to learn to trust each other. Before they know it, their relationship heats up as quickly as a Texas summer day.