Books like The Circus by Nigel West

A biography of Oleg Gordievsky, the Soviet double‑agent who, while working undercover in the KGB, supplied MI6 with critical intelligence that accelerated the collapse of the Cold War.

A definitive, document‑rich history of the CIA, revealing why presidents and CIA leaders have struggled to grasp global realities and how repeated failures have threatened U.S. national security.

During the Second World War, MI5 and British naval intelligence engineer Operation Mincemeat—feigning an invasion of Greece and Sardinia by sending a corpse laced with false documents off the coast of Spain to trick the Nazis and pave the way for the invasion of Sicily.

Henry Crumpton, a former CIA counterterrorism officer, recounts his covert operations against al Qaeda and the Taliban, detailing the agency’s strategic shift in the Afghanistan war and its impact on U.S. national security.

The Feather Men were a clandestine group of retired military officers from SAS, MI5, etc in UK. Ranulph Fiennes was proported to be one of them and exposed a series of assasinations of ex SAS officers ordered by the Sheik of Oman as a result of 3 of his sons being killed/murdered by these men in the war in his country in the '60s. (later made into a film with Robert de Niro) Very Complex and full of twists and deceipt. Was almost banned by HMG as a violation of the Official Secrets act but Fiennes declared some years later that it was just a work of fiction possibly as an appeasement to the government. Fiennes really was SAS and spent many years in dark corners of the world specializing in demolition and later became the explorer and the author on many feats of exploration and was later Knighted for his work. He also climed Everest 3 times despite him suffering from vertigo.

An exhaustive history of Britain’s MI5 and MI6, detailing their triumphs, failures, and covert operations from World War II through the present.