Above the Earth lie vast deserts blanketed in yellow sand and lifeless wilderness, mighty steel fortresses, and starships arriving from distant star systems. The poor can only make a living on the surface, while the rich indulge themselves underground and among the stars. Earth seems to be nearing its end, yet Mars is simultaneously bursting with new life: oxygen, an atmosphere, lakes and rivers... These signs of life spring up like shoots after rain. Just as humanity believes it has found a new home, danger is already closing in.