When Daisy uses AI to bring a childhood photograph of her recently departed granddad back to life, she only expects this to happen on screen. But the fully reanimated 8-year-old schoolboy appears in her bedroom and leads her outside, where the world has turned back to 1940. Daisy follows her cheeky young granddad through the cobbled streets of London’s East End, only to discover that this is the first day of The Blitz. As they seek shelter from a swarm of Luftwaffe planes, their survival depends on an old family secret.