The Treatise of the Three Impostors is a book that enjoyed centuries of notorious nonexistence until (as Voltaire would say) it became necessary to invent it. Georges Minois writes with empathy, erudition, and a novelist's sense of buildup and timing, weaving in the parallel story of Europe's courageous freethinkers. In the face of today's social and even legal pressures against criticizing religion, it is good to see an honorable French tradition asserting itself.