Their account gives a dramatic new turn to what the Obama administration and its allies would like to dismiss as an "old story" ? the September 11, 2012 Benghazi attacks that killed U.S. Ambassador Christopher Stevens and three other Americans.

Based on the new book "13 Hours: The Inside Account of What Really Happened in Benghazi" by Mitchell Zuckoff with the Annex Security Team, the special sets aside the political spin that has freighted the Benghazi issue for the last two years, presenting a vivid, compelling narrative of events from the perspective of the men who wore the "boots on the ground."