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.

Halloween 1861. A special train with two carriages steams across the Lake District at night on its way to a place notorious for its record of supernatural incidents. Lighting inside the carriages is poor, and without warning, the lamp goes out in the last compartment of the second carriage, plunging it into darkness. When the special reaches the end of its journey, the passengers pour out on to the station platform. There are almost 60 of them in all, laughing and jostling. 

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.

The reverend Dodd, vicar of the quiet Cornish village of Boscawen, spends his evenings reading detective stories by the fireside - but heaven forbid that the shadow of any real crime should ever fall across his seaside parish. But the vicar's peace is shattered one stormy night when Julius Tregarthan, an ill-tempered magistrate, is found at his house in Boscawen with a bullet through his head. The local police inspector is baffled by the lack of clues.

On an isolated farm in southern Ireland, a decades-old grave houses the dismembered bones of 11 women. Detective Superintendent Katie Maguire of the Irish Gardai is used to bloodshed, but these white bones speak of unimaginable butchery. Not far away, a young American tourist is at the mercy of a sadistic killer. His tools are a boning knife, twine, and a doll fashioned from rags, nails, and fish-hooks. The murder of his victims is secondary only to his pleasure at their pain.