A real-time account of the events on United Flight 93, one of the planes hijacked on 9/11 that crashed near Shanksville, Pennsylvania when passengers foiled the terrorist plot.

A top counter-intelligence agent thwarts a hijacking and is assigned to protect one of the terrorists who plan to turn evidence over for a plea bargain. Unfortunately, the terrorist organization attacks where the agent is guarding the man, wounding him and killing the agent's best friend. The agent decides to take down the terrorist or...