Beneath the familiar streets of London lies a city without limits. Its fiefdoms and baronies are inhabited by knights in armour and soulsucking girls in black velvet, Rat Speakers and sewer people and the myriad of other tribes, gangs and individuals who gather at the Floating Market. There is an Angel called Islington and an Earl who holds court on an Underground train. There is a beast in a labyrinth and Black Friars who guard a powerful key. And there is a girl called Door who seeks to solve the mystery of her parents' bloody murder - and avoid getting killed herself. One act of kindness throws Richard Mayhew, a young businessman with a routine job and an upwardly mobile girlfriend, into a world his dreams could only hint at. In London Below, even minding the gap is a life-threatening exercise. So where does he fit into all this? And can he ever get back?