This book offers a vision of the London Underground written in the form of a ficto-historical narrative, which combines history and fiction in the creation of a set of theoretical propositions for London's subterranean transportation network. Its amateur-scholar protagonist takes the reader on a labyrinthine journey into the world of research, with sources personified and their works appropriated and subverted. The book offers a model for practising writing and research in the context of architectural history and theory.