On Christmas Eve 1194, Sir John de Wolfe leaves a family gathering to examine a cathedral canon found hanging in Exeter. What appears to be suicide becomes suspicious, and the later murder of a local lord suggests that the two deaths belong to the same concealed dispute.
Sheriff Richard de Revelle repeatedly delays or redirects the inquiry, giving John reason to suspect that his brother-in-law is protecting a larger conspiracy. As tensions with both his wife Matilda and his mistress Nesta intensify, John follows the connection between cathedral politics, local power and a plot capable of destroying his own position.