Eccentric Jarvis lives in a cumbling schoolhouse overlooking the tube line, compiling his obsessive history of the Underground. A group of misfits are also drawn towards his strange house: Alice, who has run away from her husband and baby; Tom, the busker who rescues her; truant Jasper who finds his terrifying thrills on the tube; and enigmatic Axel, whose deadly secret casts a shadow over all their lives. Damaged, dispossessed, outcasts, they are brought together in violent and unforeseen ways by London's dark and dangerous underground system.