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. 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 discover that the locals are harbouring dark secrets and that the real killer may be a little closer to home....

The frontier zone of Archenfield in Herefordshire is a no-man's-land, which acts as a bulwark between Norman-controlled English soil and the Welsh border. Soldier Ralph Delchard and lawyer Gervase Bret arrive in Hereford for what looks like one of their more straightforward assignments from the crown, to settle conflicting claims to land in Archenfield. Ralph and Gervase are shocked to discover the murder of a principal witness, a wealthy landowner who was burned alive in his own home. No clues remain except an enigmatic red dragon cut into the turf in front of the house.

On the shocking discovery of a passenger's body on the Great Western Railway excursion train, Detective Inspector Robert Colbeck and his assistant, Sergeant Victor Leeming, are dispatched to the scene. Faced with what initially appears to be a motiveless murder, Colbeck is intrigued by the murder weapon - a noose. When it emerges that the victim had worked as a public executioner, Colbeck realises that this must be intrinsically linked to the killer's choice of weapon.

May 1915. With thousands of Britons fighting in the trenches, a severely depleted police force remains behind to keep the Home Front safe. Scotland Yard is already overstretched when the sinking of the Lusitania sparks an unprecedented wave of anti-German riots and arson attacks. Among the victims is the immigrant tailor Jacob Stein, found dead in his burnt-out shop.

December, 1380. When the corpse of Sir Robert Kilverby is discovered in a locked room, Brother Athelstan accompanies the King’s coronor to investigate. For the late Sir Robert had in his possession a sacred bloodstone which he was planning to donate to the Abbey of St Fulcher-on-Thames.