It is September 1941 and young Freddie Hackett is a message runner - he collects messages from a government office and delivers them to various destinations around London. He sets off one day with a message, along a route of bombed-out houses, and witnesses a murder. He remembers an address in Fitzroy Square, belonging to a private investigator, Maisie Dobbs. Will she believe him and help solve the mystery? A spellbinding wartime mystery.