In which we lead readers through the capital as Holmes and Watson knew it - a city of gaslight, theatres, grand hotels and shadowed alleys. This guide sets Arthur Conan Doyle's stories against the map of London, tracing their adventures from Baker Street to Brixton, from Pall Mall to Paddington. Real addresses stand beside the fictional: vanished lanes, demolished halls and invented squares, all layered onto the living city. Each entry places a story in its setting, exploring both the history and the imagination that shaped it. Whether stepping into a Turkish bath on Northumberland Avenue, following a Christmas goose to Covent Garden, or glimpsing fragments of the Red-Headed League off Fleet Street, readers walk the blurred line between fact and fiction. An essential companion for Sherlockians and London-lovers alike, Into the Fog reveals a city elusive, atmospheric and steeped in intrigue.