Testament of Youth is a poignant memoir detailing the author's experiences during World War I. The narrative follows her journey from her early life, her time as a Voluntary Aid Detachment nurse serving in London, Malta, and France, and her later years as a writer and pacifist. The author's personal loss, including the death of her fiancé and her brother, and the impact of the war on her generation, is a central theme, offering a unique female perspective on the devastating effects of war.

This memoir provides a candid and unflinching look at the horrors of World War I, as experienced by a young British officer. The narrative explores the brutality and futility of war, the author's struggle with shell shock, his disillusionment with the military and British society, and his decision to leave England for a new life abroad. It also offers insights into the author's personal life, including his troubled marriage and his relationships with other prominent figures of the time.

This semi-autobiographical novel follows the life of a young man growing up in the English countryside in the early 20th century. He's enamored with the sport of fox hunting, and through his experiences and interactions with the rural community and the natural world, he develops a deep appreciation for the beauty and tranquility of life. However, the advent of World War I shatters his peaceful existence, forcing him to confront the harsh realities of life and the brutality of war.