The Maiden's Tale — Margaret Frazer

Sister Frevisse has made an unusual journey to London, to meet the new prioress of St. Frideswide's. At the urging of her abbot, she stays with her wealthy cousin Alice, lady wife of the earl of Suffolk. But Frevisse suspects more is involved than a friendly visit--for this London home houses a secret that has turned deadly -- Alice is involved in the dangerous political machinations of the duc of Orleans and King Henry VI. Their private correspondence is being routed through the Suffolk's home until one messenger dies under mysterious circumstances and Frevisse is asked to carry letters in his place. Can she find the traitor and murderer before he strikes again...