Rosie Gardiner is having a tough war. She's had to leave her job at the Windmill in Soho after an assault which left her pregnant and is now living back at home with her dad. As the Nazis strafe the city, Rosie is determined to keep her head up but when a direct hit to her street cripples her father, it feels like the days have never been darker. Rosie decides to join the London Auxiliary Ambulance Service to keep her busy - and to give her hope in these tough times.