Vamphunter Chronicles: The Apprentice

Jeanine is a vampire headhunter, charged with bringing humans deemed worthy into her world. Her mentor, Callie, gives her a new kind of assignment: not making a human immortal, but ending his life. Jeanine accepts the assignment reluctantly, but can't stop thinking about Marcus, the strange vamp she met on the job. Marcus offers Jeanine unexpected assistance, but according to the rules of the vampire world, Jeanine must choose between loyalty to Callie and her growing attraction to Marcus.