At Grave's End by Jeaniene Frost — book slip

Half-vampire Cat Crawfield is living a dangerous life, balancing her role as a protector of mortals with her love for the vampire Bones. But when her true identity is exposed, Cat finds herself in peril. As a woman from Bones's past threatens their lives, Cat must embrace her vampire instincts to save them both from a deadly fate.

For fans of Kim Harrison and Kelley Armstrong.