MI5 Intelligence Officer Liz Carlyle is summoned to a meeting with her boss Charles Wetherby, head of the Service s Counter-Espionage Branch. His counterpart over at MI6 has received alarming intelligence from a high-placed Syrian source. It's Liz s job to find out exactly what is going on and avert disaster. But, as she discovers, this time the real threat is far greater than she or anyone else could have imagined.