The world ends not with a bang, but with a downpour. Tornadoes spin through the heart of London, New York cooks in a heat wave that melts tarmac, and Russia freezes under an ever-thickening layer of permafrost. People rally at first—organizing aid drops and evacuating populations—but the weather is only getting worse. In Durham, mild-mannered academic Danny Fennick has battened down to sit out the storm. He grew up in the Scottish Highlands, so he’s seen harsh winters before.