The world has moved on. Technology is a thing of the ancient past, as arcane as the reality-defying magic that a special few wield. London lies in ruins but it is a thriving center of humanity amidst a dark and dangerous world. It is as much a city as it is a prison, ruled by warring gangs and isolated from the rest of the world by unknown leagues of sinister wilderness.
But the imagination and ambition of men are not so easily held in check.
And, for those strong enough, the world may be soon be within reach.