Based on more than one hundred interviews with government officials, generals, diplomats, and spies---from the United States, Europe, the Arab world, and Afghanistan---and on-the-ground reporting from Morocco, Egypt, Israel, Afghanistan, Pakistan, the Philippines, and Guantánamo Bay, Miniter reveals never-before-reported Al Qaeda plots and surprising new details about the 9/11 attacks. He also shows how Khalid Shaikh Mohammed was radicalized in America and takes us inside terrorist safe houses, CIA war rooms, and the cages of Guantánamo Bay.