Wicked Bite by Jeaniene Frost

Some promises are meant to be broken…

Veritas spent most of her life as a vampire Law Guardian. Now, she’s about to break every rule by secretly hunting down the dark souls that were freed in order to save Ian. But the risks are high. For if she gets caught, she could lose her job. And catching the sinister creatures might cost Veritas her own life.

Some vows are forever…

Ian’s memories might be fragmented, but this master vampire isn’t about to be left behind by the woman who entranced him, bound herself to him, and then disappeared. So what if demons, other Law Guardians, and dangerous, otherworldly forces stand against them? Come hell or high water, Ian intends to remind Veritas of the burning passion between them, because she is the only person seared on his mind–and his soul…