It is the year 2055. The Great Scourge, a virulent disease that induces violent psychosis in those who survive its fever, has swept through the world. Entire communities were destroyed and those that survived withdrew into themselves, distrustful of strangers and fearful of anyone who may be carrying the infection.

Great Britain is no more, as the country broke into eight independent territories. London maintains a strict quarantine, protected by the Great Wall built inside the M25 and completed at ruinous cost in 2047. Across the country, the Motorway Patrol struggle to keep the main roads open. Away from major roads, only the most heavily-armed dare to go.