Quick-witted, precise, and comfortable with corpses, Kiernan O’Shaughnessy was perfectly suited to life as a medical examiner. In her four years with the coroner’s office, she never had one unhappy shift until the day they let her go. Enraged and adrift, she made her way to La Jolla, California, to set up a high-class private investigation service for medically suspicious deaths. She works only the cases she wants, and charges a steep enough fee that she can afford a cherry red Triumph and a former NFL player as a houseman. Her latest client is one of the biggest moneymakers on the planet: the Roman Catholic Church.

A troubled young priest is found hanged in Mission San Leo in Phoenix, Arizona. Hoping to avoid scandal, the bishop bypasses the police, and hires Kiernan to determine whether the death was an accident or a suicide. They ask her to be quiet, but the secrets she uncovers will make her want to sing louder than any church choir.