Newly promoted detective Celine Brennan is assigned a string of gruesome murders that no investigator has been able to solve. As she digs deeper, she also becomes suspicious of a mysterious new club in Chicago. Meanwhile, Zavier Lockwood, a 300-year-old vampire who secretly kills criminals to clean up the city, becomes obsessed with Celine after realizing she is his mate. As a dangerous threat emerges, the two are forced to work together to uncover the truth behind the growing darkness in Chicago. But their relationship is complicated by a deadly secret: Celine is falling for the very man connected to the crimes she’s sworn to investigate. This paranormal romance blends murder mystery, vampires, obsession, and forbidden love.