The Golden Notebook by Doris Lessing
This book, as well as the couple that followed it, enters the realm of what Margaret Drabble in The Oxford Companion to English Literature has called Lessing's "inner space fiction", her work that explores mental and societal breakdown. The book also contains a powerful anti-war and anti-Stalinist message, an extended analysis of communism and the Communist Party in England from the 1930s to the 1950s, and a famed examination of the budding sexual and women's liberation movements.