Hugh of Singleton, fourth son of a minor knight, has been educated as a clerk, usually a prelude to taking holy orders. However, feeling no certain calling despite a lively faith, he turns to the profession of surgeon, training in Paris and then hanging out his sign in Oxford. A local lord asks him to track the killer of a young woman whose bones have been found in the castle cesspit. She is identified as the impetuous missing daughter of a local blacksmith, and her young man, whom she had provoked very publicly, is in due course arrested and sentenced at the Oxford assizes.

LONDON, 1590. Queen Elizabeth I's control over her kingdom is wavering. Amidst a tumultuous backdrop of Spanish plotters, Catholic heretics and foreign wars threatening the country's fragile stability, the body of a small boy is found in the City of London, with strange marks that no one can explain. When idealistic physician Nicholas Shelby finds another body displaying the same marks only days later, he becomes convinced that a killer is at work, preying on the weak and destitute of London.  

It's 1194, and Sir Faucon de Ramis, the shire's newly appointed keeper of the pleas, must do his duty and make an official declaration of the cause of a miller's death. Saddled with a clerk who names Faucon his "penance", the shire's first crowner must thread the tangled relationships between the sheriff, the village of Priors Holston, and the priory that once ruled it. As a simple task takes a turn to the political, what seems obvious isn't, and what appears safe turns out to be more dangerous than he could imagine. 

London, 1654. Oliver Cromwell is at the height of his power and has declared himself Lord Protector. Yet he has many enemies at home and abroad. London is a complex web of spies and merchants, priests and soldiers, exiles and assassins. One of the web's most fearsome spiders is Damian Seeker, agent of the Lord Protector. No one knows where Seeker comes from, who his family is, or even his real name. All that is known of him for certain is that he is utterly loyal to Cromwell and that nothing can be long hidden from him.

At the May Day dancing at Glasgow Cross, Gil Cunningham sees not only the woman who is going to be murdered, but her murderer as well. Gil is a recently qualified lawyer whose family still expect him to enter the priesthood. When he finds the body of a young woman in the new building at Glasgow Cathedral he is asked to investigate, and identifies the corpse as the runaway wife of cruel, unpleasant nobleman John Semphill. With the help of Maistre Pierre, the French master-mason, Gil must ask questions and seek a murderer in the heart of the city.

Brother against brother. Father against son. Friends turned into enemies. No one in England wants a return to the bloody days of the Civil War. But Oliver Cromwell’s son, Richard, has abandoned his exile and slipped back into England. The consequences could be catastrophic. James Marwood, a traitor’s son turned government agent, is tasked with uncovering Cromwell’s motives. But his assignment is complicated by his friend - the regicide’s daughter, Cat Lovett - who knew the Cromwells as a child and who now seems to be hiding a secret of her own about the family.

London, September 1666. The Great Fire rages through the city, consuming everything in its path. Even the impregnable cathedral of St. Paul's is engulfed in flames and reduced to ruins. Among the crowds watching its destruction is James Marwood, son of a disgraced printer and reluctant government informer. In the aftermath of the fire, a semi-mummified body is discovered in the ashes of St. Paul's, in a tomb that should have been empty. The man's body has been mutilated, and his thumbs have been tied behind his back.

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.

It's 1920, and Christmas is coming. Major Lennox finds a body on his doorstep - why on his doorstep? Was it to do with the Countess? Was it about the ruby necklace? Lennox goes to Melrose Court, home to his uncle, Lord Melrose, to uncover the mystery. But then, the murders begin, and it snows, and it all becomes very complicated.

England, 1176. Aelred Barling, esteemed clerk to the justices of King Henry II, is dispatched from the royal court with his young assistant, Hugo Stanton, to investigate a brutal murder in a village outside York. The case appears straightforward. A suspect is under lock and key in the local prison, and the angry villagers are demanding swift justice. But when more bodies are discovered, certainty turns to doubt - and amid the chaos it becomes clear that nobody is above suspicion.

Oxford, 1583. Giordano Bruno, a radical thinker fleeing the Inquisition, is sent undercover to Oxford to expose a Catholic conspiracy against Queen Elizabeth. But he has his own secret mission at the University, which must remain hidden at all costs. When a series of hideous murders are committed, Bruno is compelled to investigate. What he finds makes it brutally clear that the Tudor throne itself is at stake....

As the leading churchmen and women gather at the Synod of Whitby in AD 664 to debate the rival merits of the Celtic and Roman Churches, tempers begin to fray. Conspirators plot an assassination, while mysterious, violent death stalks the shadowy cloisters of the Abbey of St Hilda. When the Abbess Etain, a leading speaker for the Celtic Church, is found murdered, suspicion inevitably rests on the Roman faction. Attending the Synod is Fidelma, of the community of St Brigid of Kildare.

In 1482 the Englishman Thomas Berrington is living in the last remnants of Moorish Spain. A physician, he is an unwilling friend to the most powerful man in the kingdom. When bodies start to turn up, each showing the marks of a savage attack, Thomas is asked to investigate.

Exeter, 1323. A strange man is entering people’s houses at night, causing panic amongst householders. Although many had thought him harmless, now he seems to have committed murder. A man lies dead in his own home, slaughtered merely for trying to protect his children, and the folk of Exeter want this menace caught and hanged. Sir Baldwin de Furnshill suspects that the solution isn’t that simple. 

AD 838. Deep in the forests of Wessex, Dunston's solitary existence is shattered when he stumbles on a mutilated corpse. Accused of the murder, Dunston must clear his name and keep the dead man's daughter alive in the face of savage pursuers desperate to prevent a terrible secret from being revealed. Rushing through Wessex, Dunston will need to use all the skills of survival garnered from a lifetime in the wilderness.