The letters, dated 1949, detail a passionate affair between Louisa's father, Denison, and Coralie's grandmother, Michelle, in post-war London. They spark Louisa to find out more about her father, who died when she was six. From the seemingly simple question 'Who was Denison Deasey?' follows a trail of discovery that leads Louisa to the libraries of Melbourne and the streets of London, to the cafes and restaurants of Paris and a poet's villa in the south of France. From her father's secret service in World War II to his relationships with some of the most famous bohemian artists in post-war Europe, Louisa unearths a portrait of a fascinating man, both at the epicenter and the mercy of the social and political currents of his time.