What secrets lie beneath a city? Tom Chivers follows hidden pathways, explores lost islands and uncovers the geological mysteries that burst up through the pavement and bubble to the surface of our streets. From Roman ruins to a submerged playhouse, from an abandoned Tube station to underground rivers, Chivers leads us on a journey into the depths of the city he loves. A lyrical interrogation of a capital city, a landscape and our connection to place, London Clay celebrates urban edgelands: in-between spaces where the natural world and the metropolis collide. Through a combination of historical research, vivid reportage and personal memoir, it will transform how you see London, and cities everywhere.