Books like The Apostate's Tale by Margaret Frazer

In 1434 Oxford, a traveling troupe prepares for the Corpus Christi festival, but a murder in their lodging forces troupe leader Joliffe to confront a wealthy merchant’s dark past.

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.

After a stay in Italy, Lady Julia returns to her Sussex estate, only to discover a murder at a nearby abbey. With private investigator Nicholas Brisbane, she navigates intrigue, family secrets and a snowbound conspiracy to uncover the killer before another tragedy.

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.

In medieval Prior Byfield, plague and famine grip the village while a twisted web of adultery, crime, and intrigue threatens its inhabitants. Nuns Sister Frevisse and Sister Thomasine investigate the betrayal that endangers the nunnery and the community.

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