When, on the spur of the moment, Norman Huntley and his friend Henry invent an eighty-three-year-old woman called Miss Hargreaves, they are inspired to post a letter to their new fictional friend. It is only meant to be a silly, harmless game—until Miss Hargreaves arrives on their doorstep. She is, to Norman’s utter disbelief, exactly as he had imagined her: enchanting, eccentric, and endlessly astounding. He hadn’t imagined, however, how much havoc an imaginary octogenarian could wreak on his sleepy Buckinghamshire hometown.