When the mutilated body of midwife and healer Agatha Kyteler is discovered in a hedge one frozen wintry morning, it seems at first that a lack of clues will render the crime impossible to solve. Then a frightened local youth inexplicably flees his village, and a hue and cry is raised in his wake. Sir Baldwin Furnshill, once a Knight Templar, has doubts about the boy's guilt. He enlists his friend Simon Puttock, bailiff of Lydford Castle, in the hunt for a murderer.

Baldwin Furnshill and Bailiff Simon Puttock have been granted leave to go on pilgrimage. Together they travel across Europe to Portugal, but danger seems to follow them, as they are among the first on the scene when a beautiful young girl is found brutally raped and murdered on the hillside of Santiago de Compostela. Baldwin and Simon lend their investigative skills to the ensuing enquiry headed by the local pesquisidore, Munio. 

As the winter of 1323 descends upon a windswept chapel on the edge of Dartmoor, who could blame the young priest, Father Mark, for seeking affection from Mary, the miller's daughter? But when Mary, and her unborn child, are found dead, Mark is the obvious suspect. Called to investigate, Sir Baldwin de Furnshill and his friend Bailiff Simon Puttock soon begin to have their doubts. Could one of Mary's many admirers have murdered her in a fit of jealousy? Or might it be someone even closer to home?

Forty years ago, Exeter's Cathedral Close was the scene of a vicious ambush. Afterwards, the bodies left lying in their blood bore witness to the conflicts tearing at the heart of the cathedral itself. Today, in 1323, murder is again polluting the Cathedral Close - but this killer is not so easily caught. The victim, Henry Potell, was feared and hated; he held secrets that some wished to keep hidden....

Bailiff Simon Puttoc’s servant, Hugh, has been granted leave to look after his wife, Constance, and her son. But their happy time is to be short-lived, for a gang of men break into their home and attack Hugh’s family. When Simon and Sir Baldwin Furnshill, Keeper of the King’s Peace, arrive on the scene the cottage is burnt to the ground, the bodies from within already buried. It seems that Hugh must have perished in a dreadful accident - but appearances can be deceptive. 

1326: Queen Isabella refuses to leave France and humiliates her husband, King Edward II, by flaunting her adulterous relationship with the arch-traitor Sir Roger Mortimer. The King is furious when he hears she has also betrothed their son to the daughter of the French Count of Hainault, and all England fears invasion. As news of an invasion fleet is received, the King’s knights, including Sir Baldwin de Furnshill, are commanded to London to protect the King and his realm. 

Baldwin and Simon are at last back on English mainland, but on their way home, they are detained by a castellan who requires their help to solve two murders on the estate. The first victim is a widow, found dead with her two children. The second is Serlo, the miller, who has recently been discovered embezzling castle money taken in tolls. As Baldwin and Simon begin a double investigation, they must look beneath the village friendships and family loyalties to find an evil killer and secure Cardinham's safety.

1325: Sir Baldwin de Furnshill and his friend Simon Puttock are sent to France to guard the King’s son. The King’s son must pay homage to the French King if he is to enable the English to keep hold of vital territory, but they are unaware that King Edward’s wife, Isabella, has grown so disaffected that she has begun to plot her revenge.  

January, 1381. As guests of the Regent, John of Gaunt, Brother Athelstan and Sir John Cranston are attending a mystery play performed by the Straw Men, Gaunt’s personal acting troupe, at St John’s Chapel in the Tower of London when the evening is rudely interrupted by sudden, violent death. Who would have the audacity to murder two of Gaunt’s VIP guests and the wherewithal to strategically position two severed heads on the stage without being noticed? The regent orders Athelstan to find out.

February 1381. London lies frozen in the grip of one of the bitterest winters on record. The ever-rising taxes demanded by the Regent, John of Gaunt, are causing increasing resentment among the city's poor. When the seething unrest boils over into a bloody massacre at a splendid Southwark tavern, in which nine people, including Gaunt's tax collectors, their military escort and the prostitutes entertaining them, are brutally murdered, the furious Regent orders Brother Athelstan to get to the bottom of the matter.

Bellicus the Druid and his friend Duro, a former Roman centurion, have already suffered a great deal in recent years but, for them, things are about to get even worse. Britain is changing. The Romans have gone and warriors from many different places seek to fill the void the legions left behind. In the south, the Saxons' expansion seems unstoppable despite the efforts of the warlord Arthur, while north of Hadrian's Wall various kings and chieftains are always looking to extend their borders. 

1325: England is a hotbed of paranoia under the reign of the unpredictable Edward II and his lover, Sir Hugh le Despenser. When the queen’s lady-in-waiting is slaughtered and a man’s body, hideously mutilated, is discovered behind the throne, the king demands to be avenged. Sir Baldwin de Furnshill, an experienced investigator of murders, is appointed to track down the killer, aided by his friend, Simon Puttock. In an age of corruption, when the king’s friends can use torture, blackmail and murder to promote their ends, a rural knight and bailiff must fight to stay alive.

April, 1144. A body is found floating in Fladbury Mill leat, a man in green who has been stabbed but not robbed. The lord sheriff’s trio discover him to be an Evesham horse dealer, who has a beautiful young wife who ‘strays’. Did the wife or one of her lovers get rid of him? What is the connection with the lord of Harvington, who wed the man’s sister, and how did that lady meet her death? The trio have to work seamlessly together to unravel the thread that links seemingly disparate deaths before even more people die, and in the process keep Walkelin from the noose. 

Easter, 1177. Canterbury Cathedral, home to the tomb of martyr Saint Thomas Becket, bears the wounds of a terrible fire. Benedict, prior of the great church, leads its rebuilding. But horror interrupts the work. One of the stonemasons is found viciously murdered, the dead man’s face disfigured by a shocking wound. When the king’s clerk Aelred Barling and his assistant Hugo Stanton arrive on pilgrimage to the tomb, the prior orders them to investigate the unholy crime.

October 1143. A mysterious archer who kills cleanly and 'dissolves' into the forest, a missing train of pack mules on the salt road from Wich and a lord in the wrong place at the wrong time mean a crime the lord Sheriff of Worcestershire cannot ignore. Bradecote, Catchpoll and the eager Walkelin are hunting a killer and a gang and whoever is giving them orders. They are not helped by a reeve keen to keep his position, a lord with his own ends to serve and a distrusting and vengeful widow with a haunted past, to whom Bradecote is increasingly attracted.