Halfway to the Grave

Halfway to the Grave is the first book in the Night Huntress series by Jeaniene Frost.

Plot
Cat Crawfield is a twenty-two year old half-vampire, the illegitimate daughter of her human mother and an unknown male vampire who left her mother after he raped her. In revenge for her mother, and because all vampire are murderous killers, Cat often frequents the local bars at night, looking for vampire to seduce and kill. On one night, she sees a blond vampire at the bar and attempts to seduce him, but he brushes her off. Confused, Cat orders a drink and is approached by another vampire. This time, she successfully seduces him and has him drive her away, where she kills him when he drives off into the woods. The next night, she returns to the bar, where the first vampire she tried to seduce the previous night comes to take her up on her offer. However, he insists that she drive them and is particularly pushy about jumping straight to having sex while Cat tries to stall. When she is momentarily distracted, he knocks her out.

Cat wakes to find herself chained in a cave. Bones, her vampire captor, believes that she is an assassin working for another vampire, and tries to force her to tell him for whom she is working. She tells the truth, but he refuses to believe her. As he is about to bite her, he suddenly sees that her eyes have changed color to a glowing green - a trait only vampires have - and is forced to believe her story. Bones then explains that he also hunts vampires, but because other vampires can sense his aura when he is near, it is difficult to attack by surprise. On the other hand, Cat has been fortunate enough to take down vampires by fooling them with her beating heart, but she isn't strong enough to fight strong vampires. He proposes a deal: if he lets her live, the two of them can work together to kill vampires, with her playing the bait and him acting as the hook. Sensing his implied threat against her family if she refuses, Cat accepts the offer.

Bones trains her very hard; his training involves such things as running through the forest at speeds even cars can't sustain and climbing cave inclines with large rocks strapped to her back. However, she does begin to get stronger and more skillful. Four weeks in, they go on a field trip so Cat can interrogate a ghost on the recent unnatural murders of young girls. Cat comes back with a long list, all apparently killed by vampires.