She went surfing in Hawaii, she loved fast cars, and she was intrigued by the new science of psychology, which helped her through devastating mental illness. So why - despite all the evidence to the contrary - did Agatha present herself as a retiring Edwardian lady of leisure?She was born in 1890 into a world which had its own rules about what women could and couldn't do. Lucy Worsley's biography is not just of an internationally renowned bestselling writer. It's also the story of a person who, despite the obstacles of class and gender, became an astonishingly successful working woman.