Archangel's Viper

Description for ARCHANGEL'S VIPER by Nalini Singh:

Once a broken girl known as Sorrow, Holly Chang now prowls the shadowy gray underground of the city for the angels. But it's not her winged allies who make her a wanted woman -- it's the unknown power coursing through her veins. Brutalized by an insane archangel, she was left with the bloodlust of a vampire, the ability to mesmerize her prey, and a poisonous bite.

Now, someone has put a bounty on her head…

Venom is one of the Seven, Archangel Raphael's private guard, and he's as infuriating as he is seductive. A centuries-old vampire, his fangs dispense a poison deadlier than Holly's. But even if Venom can protect Holly from those hunting her, he might not be able to save himself -- because the strange, violent power inside Holly is awakening…

This is #10 in A Guild Hunter Novel.