INVISIBLE. They are the American government's most powerful asset, their very existence only known to a handful of individuals. INGENIOUS. An elite unit of deep-cover agents, turning the tide in the war on terror. That is, until they start being exposed, one by one. INFILTRATED. And now a hunt to find the leak, before they all go under.

"'Eerily prescient' Sunday Express." - Sunday Express

"'Mr Ignatius is a master' The Economist." - Economist

"'The pacing is brisk, the writing is clean and efficient, and the plot is blessedly free of that fate-of-the-world melodrama that destroys far too many so-called thrillers' Washington Post." - Washington Post