Thomas Millwood meets his end. From a contemporary book illustration.

Late on the evening of 3 January 1804, a bricklayer by the name of Thomas Millwood left his home in Hammersmith, to the west of London. He was smartly dressed in the sort of clothes favoured by men of his trade: “linen trowsers entirely white, washed very clean, a waistcoat of flannel, apparently new, very white, and an apron, which he wore round him.” Unfortunately for Millwood, though, those clothes proved to be the death of him. At 10.30pm, while he was walking alone down Black-lion-lane, he was confronted and shot dead by a customs officer called Francis Smith – thus setting in motion one of the strangest, best-remembered and most influential cases in British legal history.

The Millwood murder is of interest to us because Smith’s motive for killing him was decidedly peculiar. Hammersmith, then a village on the outskirts of London, had been terrorised for more than a month by reports that some sort of malignant ghost or spirit was haunting the graveyard of St Paul’s chapel-of-ease. Today this cemetery stands in the shadow of the A4 flyover and right next to the busy four-lane Hammersmith roundabout, but 200 years ago it was considerably more isolated. St Paul’s was then still surrounded by fields, and the paths that ran past the graveyard were unpaved and unlit. It’s not difficult to see how, in the depths of winter (the Hammersmith ghost scare ran from December 1803 to January 1804), frightening stories could readily circulate, nor why several local men took it upon themselves to patrol the darkened streets in the hope of encountering and ‘laying’ the ghost. Milwood, in his all-white clothes, had been mistaken for the apparition twice earlier that same day. It was his bad luck that the third time the same mistake was made, the man facing him was not just nervous but armed with a shotgun.

Smith, when he realised his mistake, was horrified. He gave himself up immediately and was swiftly charged with murder and tried at the Old Bailey less than a week later. More