January, 1145. Godfrey Bowyer, the best but least likeable bow maker in Worcester, dies an agonising death by poisoning. Although similarly struck down after the same meal, his wife, Blanche, survives. The number of people who could have administered the poison should mean a very short investigation for the sheriff’s men, Hugh Bradecote, Serjeant Catchpoll and Underserjeant Walkelin, but perhaps someone was pulling the strings, and that widens the net considerably.

Winter, 1211. Former abbess Helewise moves back to her cell near Hawkenlye Abbey to help the needy, putting a strain on her relationship with Sir Josse D’Acquin, who is called to examine the bodies of three men, one of whom bears a complicated symbol carved into his chest: a symbol that signifies vengeance. Meanwhile, far from home, Sir Josse’s son, Ninian, has become involved in the cause of the doomed Cathar people, soon to be swept up in a fight that they cannot hope to win.

London, 1881. Lily Raynor, owner of the World's End Investigation Bureau, is growing increasingly worried. Work is drying up, finances are tight and she cannot find enough for her sole employee, Felix Wilbraham, to do. So when schoolteacher Georgiana Long arrives, with a worrying tale of runaway pupils, it seems like the answer to her prayers. Disguised as the new Assistant Matron, Lily joins the Shardlowes School staff. But there are undercurrents at Shardlowes, and the shadowy, powerful men who fund the school's less fortunate pupils loom larger as Felix's own investigations unfold.

When the body of a young man is found stuffed into the tomb of a medieval knight, Parish Constable Daniel Haze is tasked with investigating his first solo murder case. Suspicion instantly falls on the only stranger to arrive in the village of Birch Hill just before the crime took place, but the American captain proves to be an unexpected asset. A former soldier and a skilled surgeon, Jason Redmond is not only willing to assist Haze with the investigation but will risk his own safety to apprehend the killer.

Northumberland, 1809: A beautiful young heiress disappears from her locked bedchamber at Linn Hagh. The local constables are baffled and the townsfolk cry "witchcraft". The heiress' uncle summons help from Detective Lavender and his assistant, Constable Woods, who face one of their most challenging cases.

Rome, the very end of December. The Field of Mars is packed with monuments, none more beautiful than Domitian's new Odeon and Stadium. But the area has been overtaken by ugly events: elaborately staged murders. Someone bears a spectacular grudge against the theatrical community and intends to get revenge in the most spectacular way possible. The killer's method is to re-enact bloody scenes from the gruesome side of popular theatre, where characters in plays really die on stage.

This collection of recordings about Brother Cadfael—a Benedictine monk and amateur sleuth in the 12th century—are performed here by the ideal actor. Sir Derek Jacobi, who portrayed Cadfael in several television adaptations, captivates listeners with his renderings of Monk's Hood, Saint Peter's Fair, The Heretic's Apprentice, The Potter's Field, The Summer of the Danes, and Brother Cadfael's Penance.

The summer of 1273 is peaceful for most of England, except in the village of Tyndal, where Martin the cooper has been poisoned at the local inn. Martin had plenty of enemies; the killer could be anyone. Prioress Eleanor grieves for her friend, the newly bereaved Crowner Ralf, and offers what help she can. But then her own problems multiply.

It is the autumn of 1278. The harvest is in. The air is crisp. Dusty summer breathes a last sigh before the dark seasons arrive. For Prioress Eleanor, dark times arrive early in Norfolk. The head of her order, Abbess Isabeau, has sent Father Etienne Davoir from their headquarters in France to inspect all aspects of Tyndal Priory, from its morals to its roofs. Surely the abbess would not have chosen her own brother for this rare and thorough investigation unless the cause was serious and she had reason to fear intervention from Rome.

In summer of 1144, a strange calm has settled over England. The armies of King Stephen and Empress Maudhave temporarily exhausted each other. Brother Cadfael, herbalist-sleuth of Shrewsbury's Benedictine Abbey, agrees to accompany wise young Brother Mark on Church business in Wales. But the brothers soon find themselves caught up in yet another feud. A Welsh prince has banished his brother, accusing him of the treacherous murder of an ally, and the country teeters on the brink of civil war. Cadfael has to survive the brotherly quarrel that could plunge an entire kingdom into chaos.

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.

Ralph Delchard, a soldier who fought at the Battle of Hastings, and Gervase Bret, a talented lawyer, have been commissioned by William the Conqueror to look into irregularities brought to light during the compilation of the Domesday Book. A man’s body is found mutilated in Savernake Forest and the residents of Bedwyn sleep uneasy at night, fearing a monster stalking the town. When Ralph Delchard and Gervase Bret arrive, they discover that the locals are harbouring dark secrets and that the real killer may be a little closer to home....

1786, Jerusalem College, Cambridge. The ghost of Sylvia Whichcote is rumoured to be haunting Jerusalem, since disturbed fellow-commoner, Frank Oldershaw, claims to have seen the dead woman prowling the grounds. Desperate to salvage her son’s reputation, Lady Anne Oldershaw employs John Holdsworth, author of The Anatomy of Ghosts a stinging account of why ghosts are mere delusion to investigate.

In 1360, the Great Bridge over the River Cam is close to collapse. To repair it will cost the town and the University dear, especially if its rotten wood is replaced by more durable stone. As arguments rage over raising the money other, equally heated, differences are coming to the boil over the election of a new chancellor. While the majority support Brother Michael for the post, at least one of his opponents aims to seize it by fair means or foul. Then the discovery of a body under the bridge and the disappearance of two scholars throws a more sinister shadow over both disputes.

Cesare Aldo, a former soldier and now an officer of the Renaissance city's most feared criminal court, is given four days to solve the murder: catch the killer before the feast of Epiphany - or suffer the consequences. During his investigations Aldo uncovers a plot to overthrow the volatile ruler of Florence, Alessandro de' Medici. If the duke falls, it will endanger the whole city. But a rival officer of the court is determined to expose details about Aldo’s private life that could lead to his ruin.