Showing The Becoming by Jeanne C. Stein

Anna Strong is trained for anything - until she's attacked one night, only to awaken in a dark world that exists between the living and the dead. Here, Anna struggles with her love for the two men who inhabit the realms of each: Max, a human DEA agent, and Avery, a Night Watcher who joins Anna in pursuit of the vampire who changed her life. Now, as her two worlds collide, fate plunges Anna into the ultimate battle between good and evil - where survival is not just for the living.