One Foot in the Grave by Jeaniene Frost is the second book in her Night Huntress series. From the back cover~
Half-vampire Cat Crawfield is now Special Agent Cat Crawfield, working for the government to rid the world of the rogue undead. She's still using everything Bones, her sexy and dangerous ex, taught her, but when Cat is targeted for assassination, the only man who can help her is the vampire she left behind.
Being around him awakens all her emotions, from the adrenaline kick of slaying vamps side by side to the reckless passion that consumed them. But a price on her head-wanted:dead or half-alive_means her survival depends on teaming up with Bones. And no matter how hard she tries to keep things professional between them, she'll find that desire last forever...and that Bones won't let her get away again.
Frost gives the reader a fabulous read with One Foot in the Grave. Cat is a very strong woman in her own right, and Bones and Cat have some of the best chemistry ever to light up the pages. I can't wait for the next book in the Night Huntress series! I love the ways that Bones will prove his love for Cat and the ways she steps out of the box to prove her love for Bones. Cat learns more about her family in One Foot in the Grave, but also realizes that Bones and her team will always be there for her.