Active from 1898 until her death, she had a reputation for combining exciting incidents with psychological interest in her books.

Born in George Street, Marylebone, London and raised in La Celle-Saint-Cloud, France, Belloc was the only daughter of French barrister Louis Belloc and English feminist Bessie Parkes.

In the memoir, I, too, Have Lived in Arcadia, published in 1942, she told the story of her mother's life, compiled largely from old family letters and her own memories of her early life in France.

Ernest Hemingway praised her insight into female psychology, revealed above all in the situation of the ordinary mind failing to cope with the impact of the extraordinary.

[9] Belloc died 14 November 1947 at the home of her elder daughter, the Countess Iddesleigh (wife of the third Earl) in Eversley Cross, Hampshire, and was interred in France, in La Celle-Saint-Cloud near Versailles, where she had spent her youth.