At Risk (Abridged)

An announcement is made at a meeting of the British Intelligence Joint Counter-Terrorist group: “The opposition may be about to deploy an invisible.” An “invisible” is CIA-speak for the ultimate intelligence nightmare: a terrorist who is an ethnic native of the target country and who can therefore cross its borders unchecked, move around the country unquestioned, and go unnoticed while setting up the foundation for monstrous harm.

Intelligence officer Liz Carlyle has had to prove herself in...