A Private Spy, impeccably edited by his late son, Tim Cornwell, includes all the background notes necessary for a clear understanding of Le Carré’s often tumultuous life and times. In letters to friends, lovers, his agent, the press, etc., a writer’s life unfolds for us over the years. For some, the love letters and domestic correspondence will hold less interest than those growing out of a never-ending campaign to go his own way as a novelist, spy or otherwise.