Dark Waters Rising — Cassandra Clark

A storm is coming . . . Can nun sleuth Hildegard solve the murder of a lay sister before the rising flood waters trap her with a cunning killer?

Autumn, 1394. All is not well at Swyne Priory. Dissension has arisen amongst the nuns. The new novices whisper in corners, spreading malicious rumours and sharing dark secrets.

The Prioress gives Hildegard an order: search out the cause of this unrest, and put a stop to it. But before Hildegard can investigate, she's forced to deal with a new problem: the arrival of a mysterious stranger in the middle of the night, claiming his life is in danger.

Hildegard isn't sure whether to believe him, but when a body is discovered near the priory, she's soon plunged into a dark and dangerous puzzle where nothing is as it seems. All she knows for certain is that a storm is coming, threatening to cut the priory off from the outside world and trap them with a killer . . .

Medieval mystery at its finest - and a great pick for readers who love sleuthing monks and nuns like Peter Tremayne's Sister Fidelma, Ellis Peters' Brother Cadfael and Cora Harrison's Reverend Mother.