A Geek Girl's Guide to Justice (Geek Girl Mysteries #3)
Julie Anne Lindsey

Deputy US Marshal Jake Archer is working undercover when he gets the call about a murder in Horseshoe Falls. The vic may have been close with Mia's family, but it doesn't take long for Jake to discover that he had far more enemies than friends.
Horseshoe Falls is abuzz with news of the murder, and Mia's determined to get to the bottom of things, despite Jake's direct order to stand back. Jake didn't open his heart to the possibility of a future with someone just to let her get herself killed. Now they have to contain the panic within Horseshoe Falls, apprehend the fugitive and figure out how to salvage their relationship—before Mia finds herself in the crosshairs.
Book Three of The Geek Girl Mysteries