The final evacuation begins.

A year and a half after the collapse of civilisation, pirates plague the Atlantic, the Saint Lawrence River is a radioactive dead-zone, and the forests of Quebec are succumbing to disease. With insufficient supplies to last until autumn, the survivors in Eastern Canada have no choice but to flee. A final evacuation is planned, to migrate across the breadth of irradiated North America to what they hope will be permanent safety on the Pacific coast.

Until they leave, life goes on, and children grow up. For Jay, that means getting a job. Apprenticed to old George Tull, he's tasked with scouting the Digby Peninsula for roadworthy vehicles left behind during the first evacuation of Canada. Instead, he finds signs that an old foe has returned.

For the Canadian evacuation not to become a deadly tragedy like its British forebear, safe roads and intact bridges must be found. Tuck and Sorcha join the soldiers mapping the tracks and trails through the dying forests of Quebec. It should be a straightforward mission, but the starving bears and predatory wolves are not as great a danger as the desperate survivors who wish to be forgotten by the world.

With increasing desertification on land, and rising toxicity in the oceans, it is unclear for how much longer the planet can sustain life. With imminent annihilation a real possibility, the more populous group of survivors in the Pacific plan a multi-faith expedition to Jerusalem and Mecca. For the devout, it is an opportunity to complete a pilgrimage. For the politicians, it is a chance to diminish the power of the ascendant crusaders, extremists, and death cults. For a few, it is an opportunity to hunt for the friends and family abandoned during the escape from Europe.