Middle-aged Mildred is at war. She's driving an ambulance in London during the Blitz, terrified but determined to do her bit while the bombs rain down. She's living at her friend Daphne's house, sleeping in the living room alongside other women volunteers on mattresses, being cooked for by the redoubtable Mrs Dove, and working her shifts at the ambulance station. She sees the nightly destruction of London's buildings and streets close-up and death...