In the early pages of “Waiting for Sunrise,” William Boyd’s cunning tale of espionage in World War I, a Viennese soldier warns Lysander Rief, the book’s naive hero, not to be fooled by the apparent placidity of the Austrian capital. Below the surface, he warns, flows a powerful “river of sex,” capable of sweeping away anyone who wades too deeply into its waters.Rief appears in particular danger of going under. The young English actor has traveled to Vienna to seek treatment for anorgasmia, the inability to achieve climax during sexual congress. His doctor is a fellow British expatriate named Bensimon, part of a legion of psychoanalysts mushrooming in Freud’s fertile shadow throughout the city. In Bensimon’s waiting room, Rief makes the acquaintance of two patients who will play decisive roles in his life. The first, a free-spirited sculptor named Hettie Bull, soon becomes his lover. The second, a military attache at the British consulate named Alwyn Munro, will become a perhaps even more intimate figure: his spymaster.  Read on…