"Creation Lake is a novel about a freelance agent, a 34-year-old American woman of ruthless tactics and bold opinions and clean beauty, who is sent to do dirty work in France. "Sadie Smith" is how the narrator introduces herself to her lover, to the rural commune of French subversives on whom she is keeping tabs, and to the reader. We never learn her real name. Sadie has met her lover, Lucien, a young and well-born Parisian, by "cold bump"- making...