Es una aclamada biógrafa y periodista. Ha trabajado para The Daily Telegraph, Daily Mail y The Sunday Times. Su libro Clementine: The Life of Mrs. Winston Churchill fue elegido como el libro del año por The Daily Telegraph y The Independent. Just Boris, su primer libro, estuvo en la lista de los nominados al Premio Orwell. Una mujer sin importancia fue galardonado con el Premio Plutarch a la mejor biografía de 2019.

The never-before-told story of one woman's heroism that changed the course of the Second World War In 1942, the Gestapo sent out an urgent transmission: "She is the most dangerous of all Allied spies. We must find and destroy her." This spy was Virginia Hall, a young American woman--rejected from the foreign service because of her gender and her prosthetic leg--who talked her way into the spy organization dubbed Churchill's "ministry of ungentlemanly warfare," and, before the United States had even entered the war, became the first woman to deploy to occupied France. Virginia Hall was one of the greatest spies in American history, yet her story remains untold.