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In an overpopulated world where all signs of nature have been obliterated and a wall has been erected to keep out plague-ridden animals, twelve-year-old Mika refuses to believe that his twin sister

The generation ship Jacob's Ladder has barely survived cataclysms from without and within.

The ship Jacob's Ladder has arrived at its destination - the planet they call Grail. But Grail is populated by humans already, who call their home Fortune.