Devious by Lisa Jackson

This novel centers on a murder investigation at St. Marguerite's Convent in New Orleans after Sister Camille Renard is found dead, strangled with a rosary. Detectives Rick Bentz and Reuben Montoya uncover a complex web of secrets, including Camille's pregnancy and her past relationships with Father Frank O'Toole and Slade Houston, her sister Valerie Renard's estranged husband. As more nuns associated with the convent and a local prostitute are murdered, it becomes apparent that the crimes may be linked to a serial killer known as "Father John," who seemingly resurfaced after a decade. The narrative further explores the intertwined histories of the victims, their connections to the St. Elsinore's orphanage, and the personal stakes for the investigators and the surviving characters as they try to unmask the killer within the religious community.