December, 1380. When the corpse of Sir Robert Kilverby is discovered in a locked room, Brother Athelstan accompanies the King’s coronor to investigate. For the late Sir Robert had in his possession a sacred bloodstone which he was planning to donate to the Abbey of St Fulcher-on-Thames.

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.

Crowner John is summoned to investigate the murder of a tin miner. The victim worked for Devon's most powerful and successful mine owner, Walter Knapman. There seems, to be only one motive - to sabotage Walter's business. But the tinners have their own laws, and they are none too pleased at Crowner John's interference. How on earth can Crowner John sort all this out when his own life is in turmoil?

Exeter, 1195. Renovations at the new school in Smythen Street are disrupted by the discovery of a partially mummified corpse - and Sir John de Wolfe, the county coroner is called to investigate. Richard de Revelle, founder of the school, immediately tries to blame Nicholas de Arundell, a young outlawed knight living rough on Dartmoor. As Sir John discovers, Nicholas has good reason to bear a grudge against the unscrupulous de Revelle. But is he really a killer?

Following a series of murders which appear to be linked to a revival of heresy, some of the cathedral canons begin a crusade against this danger to the Church. When Sir John is accused of being too sympathetic to the heretics, the coroner finds himself having to seek sanctuary in order to save his own life. Can he survive long enough to unmask the real killer?