I’ve read Gordon Correra’s previous work in espionage literature and for this reason I was drawn to seek out this new offering. In the current climate of the Russian invasion of Ukraine under ex KGB spy, Vladimir Putin, I felt that this relatively recent work would highlight some of the ongoing dangers of Russian spies that have infiltrated our societies in the West. I did enjoy watching the TV series ‘The Americans’ that presented a fictional version of what Correra exposes as a fait accompli, the reality of embedded Russian illegals, sleeper cells inside the USA. The story skips between the lives of several of these trained Russian agents who take on fake identities of dead people in the West with a view to setting up ‘normal’ lives in the country of the Cold War enemy state. These illegals get normal jobs, buy houses, live in suburbia and slowly but surely are always looking for ways of undermining their host nation, seeking out potential contacts in their business and social lives who might be able to prove advantageous to Russia. They could be within powerful political circles or in technology or finance. These identified potential real people could be approached to become KGB / FSB / GRU agents or could be blackmailed. Obviously the game of espionage is cat and mouse and played equally voraciously by both sides. The CIA and FBI counter-intelligence in the case of many of the more recent illegals manoeuvred the whole expensive operation. A very valuable CIA source, Alexander Poteyev was head of the illegals program in the FSB and for over a decade was revealing all the critical information of the whole affair. Thus, the FBI maintained close surveillance on the spies for over a decade, watching their every move from their marital lives, their children growing up to any movements towards vital US targets in their operational activity. Putin has a twisted logic about the West and is an avid supporter of covert intelligence operations against his Cold War adversaries. His absolute detestation of treason and spy turncoats led him to attacking two ex-KGB comrades on U.K. soil. Alexander Litvinenko was murdered in London by radioactive poisoning (Polonium) and later, Sergei Skripal, who had been granted an official pardon by Putin, and had been part of a Vienna exchange by for the arrested Russian illegals, was attacked in Salisbury by a Novichok biological nerve agent but survived the assassination attempt. He had been an active MI6 agent and was released from Russian prison. It was interesting seeing how technology change and the post Soviet Union era redefined the illegals program and how Russian agents were just masquerading in the West using their real identities. The internet and social media brought a new dimension to espionage with active political meddling in the US election leading to the Donald Trump Presidential election of 2016. The book details shocking secrets of the clandestine world of international espionage and is an entertaining tale. One can only wonder how little we actually know and just how many illegals actually are still active and who successfully evaded the capture net.