Book excerpt: Eastward to Tartary, Robert Kaplan's first book to focus on a single region since his bestselling Balkan Ghosts, introduces readers to an explosive and little-known part of the world destined to become a tinderbox of the future. Kaplan takes us on a spellbinding journey into the heart of a volatile region, stretching from Hungary and Romania to the far shores of the oil-rich Caspian Sea. Through dramatic stories of unforgettable characters, Kaplan illuminates the tragic history of this unstable area that he describes as the new fault line between East and West. He ventures from Turkey, Syria, and Israel to the turbulent countries of the Caucasus, from the newly rich city of Baku to the deserts of Turkmenistan and the killing fields of Armenia. The result is must reading for anyone concerned about the state of our world in the decades to come.