Neverwhere

Neverwhere is an urban fantasy television series by Neil Gaiman that first aired in 1996 on BBC Two. The series is set in "London Below", a magical realm coexisting with the more familiar London, referred to as "London Above". It was devised by Neil Gaiman and Lenny Henry, and directed by Dewi Humphreys. Gaiman later adapted the series into novel form. The series and book were partially inspired by Gene Wolfe's novel Free Live Free