Fire, Burn!

John Cheviot boards a taxi bound for 1950s New Scotland Yard but when he gets out he finds himself in the body of a rich gentleman of the same name getting out of an 1829 hansom cab for an interview at 4 Whitehall Place by Sir Robert Peel and the first two Commissioners of the new Metropolitan Police Charles Rowan and Richard Mayne.

Just before the interview he meets Lady Flora Drayton, his lover and - though she seems familiar - he cannot fathom why as his memories of his 1950s life are starting to fade.

Flora is also present and - though a miniature pistol belonging to her late husband drops from her muff - there is no bullet hole or smell of gunpowder.

However, Vulcan's lover Kate de Bourke witnesses the fight and reveals the officers' presence to the gamblers via a suicide attempt.

Cheviot visits Flora early in the morning after the raid, finding her reading The Fatal Effects of Gambling Exemplified in the Murder of Wm.

That book's appendix and his experience practising for the shooting match make him realise that the bullet that killed Renfrew was fired from an air gun not a firearm.