During a mission to apprehend a thief, headhunter Elle Sanders captures the attention of immortals from the Order. They need her skills to solve a serial killer case involving a demon targeting human women.
Elle has spent her life avoiding the immortal world. But the Order's director makes her a deal she cannot refuse: work on the case in exchange for information about the mercenary who killed Robert, the only person she ever called family.
Throughout the investigation, Elle makes an impression on Arthur, one of the infamous Five and the vampire lord who rules the immortals in the Americas-the last person she should associate with if she wants to keep her secrets. However, staying away from Arthur proves to be impossible when Elle becomes the serial killer's next target.
Faced with a string of life-changing decisions, an irritating vampire lord who is dangerously fascinated with her, and a crime she holds the key to solving, Elle must choose between revealing her secrets or remaining silent at the expense of innocent human lives.