Bernard Lewis is the West's greatest historian and interpreter of the Near East. Books such as The Middle East and The Arabs in History are required reading for anybody who hopes to understand the region and its people. Now Lewis offers What Went Wrong?, a concise and timely survey of how Islamic civilization fell from worldwide leadership in almost every frontier of human knowledge five or six centuries ago to a "poor, weak, and ignorant" backwater that is today dominated by "shabby tyrannies ... modern only in their apparatus of repression and terror." He offers no easy answers, but does provide an engaging chronicle of the Arab encounter with Europe in all its military, economic, and cultural dimensions. The most dramatic reversal, he says, may have occurred in the sciences: "Those who had been disciples now became teachers; those who had been masters became pupils, often reluctant and resentful pupils." Today's Arab governments have blamed their plight on any number of external culprits, from Western imperialism to the Jews. Lewis believes they must instead commit to putting their own houses in order: "If the peoples of Middle East continue on their present path, the suicide bomber may become a metaphor for the whole region, and there will be no escape from a downward spiral of hate and spite, rage and self-pity, [and] poverty and oppression." Anybody who wants to understand the historical backdrop to September 11 would do well to look for it on these pages.