Once a friend of the former astronaut-turned-viceregal, John Fraser describes how Julie Payette crumbled into “perpetual petulance,” in this excerpt from his new book, The Governors General: An Intimate History of Canada’s Highest Office. It should not have ended this way. It should have ended with a national celebration of an amazing, vibrant, and still young woman who managed to surmount all the challenges in a mostly male world; who managed t…