One Foot in the Grave
To save the man she loves from the government, Cat Crawford left Bones years ago. In the meantime, she has adapted to her new life, exacting justice on rogue vampires as an agent of the United States. Thanks to Bones, who is himself a vampire, she is among the most adept at what she does, which makes her a target for assassination. Once again, she needs him in her life, although everyone else says it's a doomed relationship and he should be avoided. Bones is possibly the only person better at what Cat does than she is, and he does bring out her best. Though Cat planned on keeping things professional, Bones had other ideas.
If you want to read a book that follows a formula and is virtually indistinguishable from the last urban fantasy romance you read, or reads like a standard romance, except for the fact that the hero or heroine has fangs, fur, or both, then look elsewhere. The Night Huntress series is fresh, though it does have some of the hallmarks of the genre. Cat and Bones are a fantastic pair, perfectly simpatico, even when they are at odds. What's more, he's one of the most compelling heroes since J.D. Robb's Roarke. Don't just take my word for it though, read the books.