Ascension

"When vampires begin disappearing from a community protected by Guardian Marc Revoire, the world-weary warrior doesn't know whether he's hunting a demon or one of the bloodthirsty nosferatu — but he'd rather face either of those monsters than accept help from Radha, the irreverent, blue-skinned, and oft-naked Guardian who'd once loved him and left him. He won't be able to persuade her to leave this time, however, because lighthearted Radha is on a deadly serious mission of her own: not just to help Marc save the community…but to save him." (from author's Web site - <a target="_blank" rel="noopener" href="http://meljeanbrook.com/books/the-guardian-series/angels-of-darkness/">this link.</a>)