Books like The reeve's tale by Margaret Frazer

When the vanished Sister Cecely returns to St. Frideswide's priory with her illegitimate son, her presence forces the nuns to confront doubts about faith, repentance and loyalty—raising tension that may culminate in danger.

Sister Fidelma, a Celtic nun and Brehon lawyer, teams up with Roman Brother Eadulf to solve a murder at a pivotal 7th‑century Whitby synod, amid church rivalry and looming treason.

Geoffrey Chaucer’s The Canterbury Tales is a collection of 24 Middle‑English stories told by a diverse group of pilgrims on a journey to Canterbury, offering vivid insight into medieval English society, religion, and morality.

It is an hour of desperate need for St. Frideswide's. Thrust into financial ruin by the incompetence and corruption of their former prioress, the nuns have become trapped under the thumb of Abbott Gilberd as he pries into every possible corner of the priory's life. In an effort to escape their desperate straits, Dame Frevisse is forced to journey to London in order to seek both a new prioress and financial aid for her beleaguered sisters. Once there, she turns to her wealthy cousin Alice, lady wife of the influential earl of Suffolk. But with a new Parliament warming to its arguments, Frevisse discovers that Alice's need may be even greater than her own. Caught between the powerful Gloucester, the machiavellian Bishop Beaufort, and the darkly handsome Duke of Orleans, Alice is torn by the broken loyalties of those she loves the most. Before she can unravel the twisted turns of romance and deception, Frevisse herself is caught up in the intrigue, carrying secret messages which will determine England's future. But the mystery deepens when one of the other messengers is killed, and Frevisse must solve the murder in order to save not only herself, but Alice's immortal soul. Sister Frevisse - Book 08

Dame Frevisse, a nun, leaves her cloister to chase her outlaw cousin Nicholas up the King's Highway, confronting the law, her vows, and a deadly manor where faith and greed collide.

A dark lady rides back into the life of Dame Frevisse, bearing with her two small boys haunted by the touch of death and scandal. Nine men lie dead on the road behind them, victims of the grim fate which relentlessly pursues them. Some seek to turn them away, but when they request sanctuary Frevisse is bound by her holy oaths to grant it. But in welcoming them within the walls of St. Frideswide, has Dame Frevisse allowed death to stalk the nunnery's halls? When she begins to untangle the mystery of these strange guests, the truth she discovers may be enough to doom them all. Forced to keep secrets better left untold even from the nuns of her own order, Frevisse is caught in a crucible between faith and duty. To learn the boy's name is to be drawn into a conspiracy of shame. To hear the boy's tale is to face death. Sister Frevisse - Book 05

Sister Fidelma, a sharp‑witted Celtic nun, is called to Rome in 664 AD to investigate the murder of the Archbishop-designate of Canterbury and a theft of valuable relics amid the religious turmoil of Christendom.