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.