London, 1923. Newly minted research assistant Saffron Everleigh is the first woman to hold the position at University College of London. When she attends a dinner party for the school, she expects to engage in conversations about the university's large expedition to the Amazon. What she doesn’t expect is for Mrs. Henry, one of the professors’ wives, to drop to the floor, poisoned by an unknown toxin. Dr. Maxwell, Saffron’s mentor, is the main suspect, and evidence quickly mounts.

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?

Salisbury, 1226. A young pregnant woman is found tangled in reeds in the river Avon, her identity a mystery. Grieving widow Ela Longespée is determined to succeed her husband as sheriff of Salisbury, and quickly takes charge of the investigation. She soon finds herself in the thick of a neighborhood scandal and a struggle to maintain her authority. With multiple suspects, can she identify the true 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?

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?