First Class Male (You've Got Mail #1)
Jillian Hart

U.S. Marshal Mason Greer has been hot on the Folsom Gang's trail for nearly a month, and when he and his men raid the outlaw's camp, he arrives just in time to save Callie from a brutal end. This is his mission, his life's only purpose. To catch each and every outlaw and put them behind bars where they can never hurt anyone again. Mason has no time for romance and after a tragic loss years ago, he has no heart for it either. But when he finds himself desiring beautiful and captivating Callie, will he be strong enough to open his heart? Or will he wind up losing the best thing that's ever happened to him--Callie's love?