"Jonna Hiestand Mendez began her CIA career as a "contract wife," a second-class citizen who was hired as a convenience to her husband, a young officer stationed in Switzerland. She needed his permission to open a bank account or shut off the gas to her apartment, and she performed menial duties for the CIA. Despite battling sexism at all levels of the agency, Mendez's talent for espionage was clear, and she soon took on bigger and more significant...