In the aftermath of 9/11, the United States and its allies face a new kind of enemy in an unconventional conflict, while Americans adjust to a new normal of heightened security at home; the conflict begins in Afghanistan, then spreads to Iraq.

The war on terror enters a new phase as homegrown lone wolves begin to strike in the United States; ISIS and other terrorist groups use the Internet to enlist and inspire individuals; white nationalists helm a new wave of domestic terror.