Extraordinary rendition, secret CIA prisons, enhanced interrogation - what really happened inside the Bush administration's "war on terror"?
HARDtalk's Stephen Sackur spoke to a man who has come out from the shadows to throw an unforgiving light on America's counter terror campaign.
Glenn Carle served with the CIA for more than two decades and was handpicked to interrogate one key al-Qaeda suspect after 9/11. He's now written about it, and stoked new controversy in Washington.
Watch the full interview on BBC World News on Wednesday 10th August at 03:30 GMT, 08:30 GMT, 15:30 and 20:30 GMT and on the BBC News Channel on Wednesday 10th August at 04:30 BST and at 00:30 BST on Thursday 11th August.