After a series of apparent suicides that have left four young women dead, a worried mother hires Taylor to find her missing 18-year-old daughter. But something about his new client makes the detective uneasy. While getting to the bottom of the earlier deaths, he discovers that the mother may have an ulterior motive for her search.

Taylor is hired to look into past abuses at the infamous Magdalen laundries, the city's home for "wayward girls". The daughter of a former inmate wants him to track down a woman called "Lucifer", a particularly brutal nun who worked there. In the wake of two execution-style murders, Taylor realizes he's not alone in searching for Lucifer.