A unique portrait of war - and a charming coming-of-age story - from the private diaries of Winston Churchill's youngest daughter, Mary.

I am not a great or important personage, but this will be the diary of an ordinary person's life in war time. Though I may never live to read it again, perhaps it may not prove altogether uninteresting as a record of my life - or rather the life of a girl in her youth, upon whom life has shone very brightly, who has had every opportunity of education, interest, travel and pleasure and excitement, and who at the beginning of this war found herself on the threshold of womanhood.

In 1939, 17-year-old Mary found herself in an extraordinary position at an extraordinary time: it was the outbreak of the Second World War and her father, Winston Churchill, had been appointed first lord of the admiralty; within months, he would be prime minister.

The young Mary Churchill was uniquely placed to observe this remarkable historical moment and her diaries - most of which have never been published - provide a front-row view of the great events of war, as well as exchanges and intimate moments with her father. But they also capture what it was like to be a young woman during wartime. An impulsive and spirited writer, full of coming-of-age self-consciousness and joie de vivre, Mary's diaries are untrammelled by hindsight or self-censorship or nostalgia.

From aid raid sirens at 10 Downing Street to seeing action with the ATS, from cocktail parties with presidents and royals to accompanying her father on key diplomatic trips, Mary's wartime diaries are full of colour, rich in historical insight and a charming and intimate portrait of life alongside Winston Churchill.

Compiled and edited by Mary's daughter, Emma Soames, in collaboration with The Churchill Archives Centre.