Trade is Treachery (1981), in which he publicized for the first time the suspicions that MI5's former Director General Roger Hollis had been a spy for the Soviet Union, and described MI5's and MI6's internal inquiries into the matter. Pincher was at one point close to Peter Wright, who, he knew, suspected Harold Wilson of having been a Soviet agent, and according to the biography of Wilson written by Ben Pimlott, Pincher was trying to get information from Wright so that he could accuse Wilson in a public setting in the near future. Wright, a retired MI5 Soviet counterespionage officer, was Pincher's main source for Their Trade is Treachery, along with MP Jonathan Aitken and Wright's former colleague Arthur S. Martin. Aitken, using information from retired CIA counterespionage chief James Jesus Angleton, wrote a highly confidential letter in early 1980 to Prime Minister Margaret Thatcher, outlining Angleton's suspicions of Hollis acting as a double agent. Pincher became ensnared in 1986 in the Spycatcher affair, when Wright tried to publish his own book in Australia, in apparent violation of his oath-taking of the Official Secrets Act when he joined MI5. The matter led to prolonged legal wrangling, with the British government mounting a strong defence against publication, which was ultimately unsuccessful through three levels of the Australian court system. Wright was represented by the barrister Malcolm Turnbull who, in 2015, became the 29th Australian Prime Minister. During his cross-examination, Turnbull exposed the British Cabinet Secretary, Sir Robert Armstrong, in a clear lie. In the meantime, Spycatcher was published in the United States in mid-1987, where it became a best seller. Pincher was investigated and cleared of any wrongdoing, through a police investigation. Death Pincher died on 5 August 2014 at Kintbury in West Berkshire, aged 100 years old, having suffered a stroke seven weeks earlier. He died with his family by his side, talking about his time in espionage and the power it gave him in his career. Pincher's son reported that his last joke was "Tell them I'm out of scoops." Publications The Breeding of Farm Animals (London: Penguin, 1946) Into the Atomic Age (London: Hutchinson, 1948) It's Fun Finding Out (with Bernard Wicksteed, 1950) "Secrets et mystères du monde animal" (spotlight on animals; London: Hutchinson and Co., 1950. Collection "les livres de la nature", préface de jean Rostand pour l'édition française, chez Stock 1952) Not with a Bang (novel,