Mara Venn enters a vampire's blood feast under a dead woman's name, intending to steal the register that might reveal what happened to her missing sister. Lord Adrian Rook catches her before she reaches his study. Instead of turning her over to the Blood Revenue Office, he offers her a bargain: seven nights of protection in exchange for her skill at detecting forged records. Together, they uncover a list of people officially declared dead whose identification numbers are still moving through the city's freight system. One of those people is Mara's sister. But the closer Mara gets to the truth, the harder it becomes to ignore the vampire beside her—or the old order bearing his signature. He may be the only man powerful enough to help her expose the conspiracy. He may also be part of the reason it exists.