Companions
By Susan Sizemore, 2001
Series: Laws of the Blood

Third book in the Laws of the Blood series. "For some vampires, humans make the best pets... Selena Crawford is a Chicago homicide detective and the unwilling "companion" of Istvan, chief enforcer of vampire law. Though bonded by blood, they want next to nothing to do with each other. Until a vampire murder brings a threat close to home..." (from Amazon.com)