The period 1943-45 saw some of the most important events of the Second World War, and few were fully aware of the decisions that were to affect the outcome of a global conflict. Yet, a young wartime secretary, Olive Christopher, spent this remarkable time working in Churchill's famous Cabinet War Rooms, where she was one of a tiny inner circle of people party to the political secrets of the crucial final years of the Second World War. Working for long hours in an underground bunker opposite St James' Park, Olive wrote a series of letters to her fiance, a major in the armed forces and posted abroad. Filled with incredible details about the glamorous lifestyle and travel Olive enjoyed because of the seriousness of her job, these letters form an astonishing record of how an ordinary girl could become privy to the most secret aspects of the Second World War. Published for the first time, this illuminating and poignant correspondence offers a rare insight into the workings of the Cabinet War Rooms towards the end of the Second World War, and documents the rich wartime experiences of a woman with exclusive access to the closed world of Churchill's inner circle.