Born in 1922, Mary Churchill was Winston and Clementine’s fourth daughter and youngest child. In January 1939, when she began keeping the diary that forms Mary Churchill’s War: The Wartime Diaries of Churchill’s Youngest Daughter edited by Emma Soames, Mary was a sixteen-year old and last of the Churchill children still living with their parents. During the war years she grew into a young adult, joined the Auxiliary Territorial Service serving with anti-aircraft batteries in Britain and in Europe, and accompanied her father on some of his travels, including as an aide at the Quebec Conference and on the prime minister’s visit to liberated France in 1944.The diaries are delightful as Mary records her personal thoughts and concerns as a teenager as well as her family life, social life, war service, and observations of the great events at which she was present as the daughter of the prime minister. Most interestingly, the diaries reflect her close relationship with her parents as well as the turbulent relationship her brother Randolph had with his family as she writes on January 3, 1943 that she does not love her brother and “cannot forgive him for the disappointment – sorrows & troubles he has caused Papa & Mummie.” In the diaries, Mary reflects a charming self-awareness when she writes on August 17, 1943 while at the Quebec Conference that “here I am daughter of one of the greatest men & reading my diary I find it is an account of ME!” She concludes that she cannot be “madly objective & Boswellian” and instead vows to continue to record “My day.” Mary Churchill’s War is an interesting and delightful read.