When war breaks out Annie Webster and her closeknit family find themselves - along with everyone else in the country - thrust into a world of uncertainty, danger and despair. Her brothers join up, her sweetheart Paul becomes a fighter pilot, and Annie, desperate to help, finds herself in the WAAF, where her intelligence and warmth singles her out for a role more daring than she can ever have known.

All the time, the Battle of Britain is raging in the skies above her. The country has never needed its young people more, but will Annie and her loved ones survive its darkest hour?