Answer: A four-wheeler carried Holmes, Watson and Miss Morstan from the Lyceum Theatre through foggy London to Thaddeus Sholto’s house, and from there, with Thaddeus, on to Pondicherry Lodge at Upper Norwood, the residence of the late Major Sholto.
Outside the Lyceum Theatre a coachman put them into a four-wheeler, which rattled at a furious pace through the dark, foggy, gas-lit streets. Watson and Miss Morstan lost all sense of direction, but Holmes named every street — Vauxhall Bridge Road, Wordsworth Road, Cold Harbour Lane — as they crossed the river into a gloomy suburb of new, dull brick houses, where Thaddeus Sholto lived. After hearing his story, they drove on with Thaddeus, who chattered nervously all the way, to Pondicherry Lodge, Upper Norwood, Major Sholto’s old house, surrounded by a high stone wall with an iron-clamped gate guarded by the porter McMurdo.