Sixteen-year-old Nina Kane should be worrying about her immortal soul, but she's too busy trying to actually survive. Her town's population has been decimated by soul-consuming demons, and souls are in short supply. Watching over her younger sister, Mellie, and scraping together food and money are all that matters. The two of them are a family. They gave up on their deadbeat mom a long time ago. When Nina discovers that Mellie is keeping a secret that threatens their very existence, she'll do anything to protect her. Because in New Temperance, sins are prosecuted as crimes by the brutal Church and its army of black-robed exorcists. And Mellie's sin has put her in serious trouble.