how they got there, no notion of time, and only vague recollection of their lives before. But, as the burn of electric light merges day into night and numberless years pass, a young girl - the fortieth prisoner - sits alone, an outcast in the corner. Soon she will show herself to be the key to the others' escape and survival in the strange world that awaits them above ground. The woman who will never know men. With a new introduction by Sophie Mackintosh, Booker Prize-longlisted author of The Water Cure.