York, 1374. A member of a prominent family is discovered in the woods with his throat torn open, provoking rumours that wolves are roaming near the city. Persuaded out of retirement by the victim's father, Owen Archer is certain that a human killer staged the attack, but a second man is then found stabbed to death.
The two killings lead Owen into the secrets of a divided household and raise questions about what apprentice healer Alisoun has witnessed. Geoffrey Chaucer, in York on a confidential mission for Prince Edward, joins the inquiry, and their separate lines of investigation converge on a conspiracy whose political consequences extend beyond the original family dispute.