On the outside, John Parrish is a highly successful doctor, having risen to the top of his field as department head at Harvard Medical School and Massachusetts General Hospital. nside; however, he was so tortured by the memories of his tour of duty as a marine battlefield doctor in Vietnam that he was unable to live a normal life. The author delivers an unflinching narrative chronicling his four-decade battle with the unseen enemy in his own mind as he struggled with Post Traumatic Stress Disorder.