検索キーワード： 制作 "W. F. Howes Ltd" ハードSF

The year is 2381. The place is Urban Monad 116 of the constellation Chippitts. The population of this one-thousand storey super-structure is 800,000+ and always growing. After two centuries of ruthless, selective breeding, the essence of life is to be blessworthy and to multiply; to afford one's neighbours any type of sexual fulfilment and, above all, to avoid the evil of frustration. But, within this seemingly blissful vertical world there are individuals who feel such perverse desires as a longing for privacy, a wish to descend from the heights, to walk on earth and bask in the sunshine.

Four students discover a manuscript, The Book of Skulls, which reveals the existence of a sect, now living in the Arizona desert, whose members can offer immortality to those who can complete its initiation rite. To their surprise, they discover that the sect exists, and is willing to accept them as acolytes. But for each group of four who enter the rite, two must die in order for the others to succeed.