It's not really science-fiction, ... It's the world 30 years from now, [a time] in which for 18 years no human child has been born, for unknown reasons. Civilizations are falling apart. England is the last remaining civilization as we know it, because it's an island that's insulated itself from Europe, which is in civil wars and complete pandemonium. So the story takes place in that context. It's a story about hope and faith.