Ralph Delchard, a soldier who fought at the Battle of Hastings, and Gervase Bret, a talented lawyer, have been commissioned by William the Conqueror to look into irregularities brought to light during the compilation of the Domesday Book, the great survey of England. Their investigations take them throughout the kingdom, but the pair often find themselves embroiled in more sinister mysteries in the towns they visit. The King's work is a dangerous business.

A man's body is found mutilated in Savernake Forest and the residents of Bedwyn sleep uneasy at night, fearing a monster stalking the town. When Ralph Delchard and Gervase Bret arrive, they soon discover that the locals are harbouring dark secrets and that the real killer may be a little closer to home.