Crimson City Series by Marjorie M. Liu

Los Angeles is no longer the City of Angels; dark things haunt its streets- dark restless things. Bodies have been found, and the tentative peace between humans, vampires, and werewolves teeters on the brink of collapse. Keeli Maddox needs to know why. If she and her kin are to survive, she must trust a man as different from her as night from day, as tooth from claw. He's a slayer, a betrayer, an enemy. But nobility lurks in dark places, and Keeli herself is no stranger to shadow... moreLos Angeles is no longer the City of Angels; dark things haunt its streets- dark restless things. Bodies have been found, and the tentative peace between humans, vampires, and werewolves teeters on the brink of collapse. Keeli Maddox needs to know why. If she and her kin are to survive, she must trust a man as different from her as night from day, as tooth from claw. He's a slayer, a betrayer, an enemy. But nobility lurks in dark places, and Keeli herself is no stranger to shadow. As sure as the moon will rise, Michael was meant for her. Life is about to change. Only three things will remain: the color of blood, the hot joy of skin on skin, and the danger in a taste of crimson. less