Quiet As a Nun — Antonia Fraser

When a murder takes place in a secluded tower at Blessed Eleanor's Convent in Sussex, and the victim is an old school friend, investigative TV reporter Jemima Shore finds herself in the middle of a disturbing puzzle. The dead woman, a nun and heiress to one of the largest fortunes in Britain, has left a note proclaiming "Jemima will understand what is going on here. Jemima knows...." Mother Ancilla has called on Jemima for help, and the nuns are sure that she can clear up the mystery. Jemima is not at all convinced she can--or that the danger is over.

The schoolgirls are full of rumors about what happened as Jemima, armed with her journalist's sense of a story, and a relentless curiosity, walks into the eye of a worldly storm of fear. The more she learns, the clearer it becomes that more lives, including her own, are being threatened. The search for the true legacy of Sister Miriam, Jemima realizes, is turning inexorably from the mysterious to the terrifying.