Spy Catcher by Peter Wright

The Candid Autobiography of a Senior Intelligence Officer

A former British counterintelligence officer recounts years in MI5, detailing clandestine operations, innovative surveillance and bugging techniques, and the fraught hunt for Soviet spies within the service, including allegations that a top official was a mole; it also exposes bureaucratic infighting and the legal battle with the government over publication, offering a controversial insider’s view of Cold War espionage.