Small communities of future humans, partially adapted to the harsher climate, survive united by the "Great Planetarium" communications web.

The means for human survival are rapidly diminishing beyond repair, with the remaining supplies of water failing or becoming increasingly hard to find.

Along with this, a barely comprehensible form of life – "ferromagnetals" ("les ferromagnétaux") – have begun to develop and spread within and throughout the Earth itself.

The narrative focuses mainly on group of humans led by Targ, who at the beginning of the story is the "watchman" ("veilleur") of the Great Planetarium.

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