Robert Baer was known inside the CIA as perhaps the best operative working the Middle East. Over several decades he served everywhere from Iraq to New Delhi and racked up such an impressive list of accomplishments that he was eventually awarded the Career Intelligence Medal. But if his career was everything a spy might aspire to, his personal life was a brutal illustration of everything a spy is asked to sacrifice. Bob had few enduring non-work friendships, only contacts and acquaintances. His prolonged absences destroyed his marriage, and he felt intense guilt at spending so little time with...