It has been the home to priests and prostitutes, poets and spies. It has been the stage for an improbable flirtation between an Israeli girl and a Palestinian boy living on opposite sides of the barbed wire that separated enemy nations. It has even been the scene of an unsolved international murder. This one-time shepherd's path between Jerusalem and Bethlehem has been a dividing line for decades. Arab families called it "al Mantiqa Haram." Jewish residents knew it as "shetach hefker." In both languages, in both Israel and Jordan, it meant the same thing: "the Forbidden...