This biography investigates the life and political influence of Aubrey Herbert, a British diplomat and intelligence officer whose unconventional activities in the Middle East and the Balkans earned him the moniker 'Greenmantle'. Margaret FitzHerbert, drawing upon family archives and historical records, reconstructs the career of a man who navigated the complexities of the Ottoman Empire and the shifting geopolitical landscape of the early 20th century. The text argues that Herbert’s unique cultural empathy and linguistic abilities provided him with insights that often diverged from official British foreign policy.

Historians and biographers frequently cite this work as a definitive account of a complex, often overlooked figure in British imperial history. Readers note the meticulous research and the balanced portrayal of Herbert’s successes and failures in the diplomatic arena.