A chance encounter in Spain in 1959 brought young Irish reporter Valerie Danby-Smith face to face with Ernest Hemingway. The interview was awkward and brief, but before it ended something had clicked into place. For the next two years, Valerie devoted her life to Hemingway and his wife, Mary, traveling with them through beloved old haunts in Spain and France and living with them during the tumultuous final months in Cuba. In name a personal secretary,...