9/11 almost instantaneously remade American politics and foreign policy. The wars in Iraq and Afghanistan, the Patriot Act, water boarding and Guantanamo are examples of its profound and far-reaching effects. But despite its monumental impact--and a deluge of books about al-Qaeda and Islamist terrorism--no one has written a serious assessment of the man who planned it, Osama bin Laden. Available biographies depict bin Laden as an historical figure, the mastermind behind 9/11, but no longer relevant to the world it created. These accounts, Michael Scheuer strongly believes, have contributed to...