"Haunted London" introduces the reader to the grandiosity and complexity of London as perceived by historical figures like Dr. Johnson and Boswell. It sets the stage by reflecting on the sheer vastness of human habitation within the city and how its past is intricately woven into its fabric. Thornbury expresses a deep affection for London and hints at his intent to guide readers through various locales, uncovering fascinating anecdotes and events tied to them. He describes the physical and cultural changes in London, underlining the tension between progress and the preservation of historical memory, which propels the journey he invites readers to embark upon through the book. (This is an automatically generated summary.)