A rich landowner cuts his stepson out of his will to leave his fortune to Shrewsbury Abbey, and is found poisoned. When Cadfael is called in to investigate, he is shocked to find that the dead man's wife is his own childhood sweetheart, whom he has not seen for forty years.

A great wedding is to take place at the Abbey, between a beautiful young girl and a powerful baron. But this is no love match, and when the baron disappears before the wedding, Cadfael is on the case.

When Shrewsbury's goldsmith is robbed and left for dead, the locals launch a witch-hunt. Pursued by the mob, the prime suspect, a young juggler who performed at the wedding of the goldsmith's son, seeks sanctuary at the Abbey. But as Cadfael investigates, a second body is found floating in the River Severn.

Brother Cadfael has settled down to a quiet religious life at Shrewsbury Abbey after an adventurous, and far from monastic, youth. But when he uncovers a murder, he turns detective to solve the crime.