Explores the world of subways, discussing their inventor and history, how they work, what it is like to travel on them, and how early models compare with modern ones.
Richard Mayhew, a young businessman living in London, helps an injured girl and finds his life changed when he leaves reality and enters the city's underground world of sewers and abandoned subway stations--a world in which the girl he helped is someone of power and nobility.
Surveys the early subways of London, Paris, New York, and other cities of the nineteenth century and examines how they were built and those responsible for their construction.
When fourteen-year-old Lindsay meets Talon and discovers the Downsiders world which had evolved from the subway built in New York in 1867 by Alfred Ely Beach, she and her new friend experience the clash of their two cultures.