Matthew Bartholomew, unorthodox but effective physician to Michaelhouse college in medieval Cambridge, is as worried as anyone about the pestilence that is ravaging Europe and seems to be approaching England. But he is distracted by the sudden and inexplicable death of the Master of Michaelhouse - a death the University authorities do not want investigated.

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.

Spring, 1663: public London is executing plans to mark the third anniversary of the Restoration. Private London, murky, dangerous and seething with intrigue, is entertaining other plans. And other executions - for the death of wealthy merchant Matthew Webb and the killing of an apparent vagrant during a royal procession. Thomas Chaloner, spy for the king's intelligence service, soon realises that two murders point in one direction: upwards, towards the great and supposedly good.

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.

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.

After his recent unveiling of a devious assassin, Sir Hugh Corbett has returned to service as the Keeper of the Secret Seal, begrudgingly admitting that his appetite for adventure has once again been whetted. Summoned to meet the King to be congratulated on their work together, Corbett and Ranulf learn of the death of Corbett's close friend, Ralph Grandison. Ralph, a leper, has been found dead in a rowing boat, a dagger thrust through his chest. But this murder is not the first of its kind.

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.  

The follow-up to the best-selling Heresy sees the return of Giordano Bruno, religious exile and renegade monk…Autumn, 1583. As an astrological phenomenon heralds the dawn of a new age and Mary Stuart’s supporters scheme to usurp Elizabeth, a young maid is murdered, occult symbols carved into her flesh. Giordano Bruno is called on to use his cunning to infiltrate the plotters and find evidence against them. In fear for his life, Bruno discovers that the young woman’s murder could point to an even more sinister truth…

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.

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.