Paul McAuley’s 2022 Beyond the Burn Line is a stand-alone science fiction novel.
Six hundred thousand years before the time of the novel, the ogres failed so egregiously to properly caretake the Earth that scorch marks are still visible in the geological record. The ogres were replaced by the cruel but capable bears, whose domination of their home continents lasted for thirty millennia. Six centuries ago, the bears fell to madness, leaving their domain in the hands of their former Procyonic slaves. In the six centuries since, the citizens of the Union and United Territories have done their best to follow an equitable and prudent course that will steer them away from the fates of ogre- and bear-kind.
The first signs that unexpected transformation is coming arrives in the form of an academic puzzle.