When Edmund White moved to Paris in 1983, leaving New York City in the midst of the AIDS crisis, he was forty-three years old, couldn't speak French, and only knew two people in the entire city. But in middle age, he discovered the new anxieties and pleasures of mastering a new culture. When he left fifteen years later to take a teaching position in the U.S., he was fluent enough to broadcast on French radio and TV, and in his work as a journalist,...