On September 4, 2001, Robert Mueller took over the FBI. At his confirmation hearings, fraud had overshadowed discussions of terrorism. And as FBI Director, Mueller quickly diverged from the common understanding that the attacks that killed 3,000 people had been an act of war rather than a crime. In 2008, Abdullah Saleh al-Ajmi, who had been unleashed from Guantanamo Bay, carried out a suicide bombing in Iraq. Al-Ajmi had been represented by Thomas Wilner who was being paid by the Kuwaiti government. Wilner was a pal of Robert Mueller. And when the families were having dinner together, Mueller got up...