Paul O’Connor reviews a work of history that has Nazis, espionage, steamy love affairs and writing that rivals today’s best spy novels. Reviewed by Paul T. O’Connor SISTERS IN RESISTANCE: How a German Spy, a Banker’s Wife and Mussolini’s Daughter Outwitted the Nazis. By Tilar Mazzeo. Grand Central Publishing. 254 pages. $30, hardcover. If you…