A massacre in Libya ends in the deaths of four Americans.

In an exclusive interview, Bret Baier reveals the hidden story behind the killings. What did Washington know and when?

Plus, Greg Palkot is on the ground with a moment-by-moment account of the attack, Catherine Herridge searches for signs of growing Al Qaeda power, and Ed Henry has the latest White House reaction.

Watch as Bret Baier hosts Special Report Investigates: Death And Deceit In Benghazi, tonight at 10p/1a ET.