Osama bin Laden is killed in a daring raid in May of 2011.Now, in the months leading up to September 11, 2012, veteran Counterterrorism Agent John O'Malley and Intelligence Specialist Sara Dubowski uncover seemingly unrelated events that suggest that the United States is about to become the target of a retaliatory terrorist attack. Russia has lost a nuclear weapon, a sleeper cell has stolen four tons of ammonium nitrate, and al Qaeda is training pilots at a camp in Pakistan. O'Malley and Dubowski work to protect their country, but time is running out. In a stunning twist, al Qaeda's plans finally become all too evident...but is it too late?