Narrative and Structure The film follows a small, disparate group of survivors in a fractured Britain where pockets of organized communities and roving enclaves vie for resources and ideology. Rather than rely solely on immediate, visceral scares, the screenplay interleaves flashbacks with present-day scenes to reveal how different characters adapted across decades. This structure emphasizes continuity: the virus’s physical threat endures, but equally potent are the long-term social consequences—eroded institutions, uneven historical memory, and competing myths about the pre-collapse world.