Elizabeth cautiously negotiates a regime change in Algeria in an attempt to prevent a civil war. But then her plans fall apart with the unexpected death of the trusted U.S. Ambassador to the divided North African country. Meanwhile, Henry launches a crusade to save religious antiquities that are being destroyed by Hizb al-Shahid; and the McCord children get their own security detail as FBI Director Keith Doherty looks into the hacking of Jason's computer.