The Bletchley Girls weaves together the lives of 15 women who were all selected to work in Britain's most secret organisation - Bletchley Park. It is their story told in their voices. Tessa Dunlop met and talked to these fascinating female secret-keepers and captures their extraordinary journeys into an adult world of war secrecy love and loss. Through the voices of the women themselves this is a portrait of life at Bletchley Park beyond the celebrated code-breakers it's the story of the girls behind Britain's ability to consistently out-smart the enemy.