In Quietly In Their Sleep, a nun, Suorimmacolata, leaves her order and the nursing home it runs when she begins to suspect that some of the patients, those who have left their money to the home, are discreetly being murdered. Turning for help to Guido Brunetti, the suave, subtle and worldly-wise comissario of police, she unwittingly leads him into an investigation of both the closed world of the powerful, secretive church organization known as Opus Dei and the very public scandal caused by a local parish priest.