"Deep underground, thirty-nine women live imprisoned in a cage. Watched over by guards, the women have no memory of how they got there, no notion of time, and only a vague recollection of their lives before. As the burn of electric light merges day into night and numberless years pass, a young girl--the fortieth prisoner--sits alone and outcast in the corner. Soon she will show herself to be the key to the others' escape and survival in the strange...