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In Treachery, noted intelligence authority Chapman Pincher makes a compelling case that Roger Hollis, head of MI5 from 1956 to 1965, was himself a double agent, acting to undermine and imperil the UK and America. Myriad intriguing case histories are portrayed, including that of Lt Igor Gouzenko, a Red Army cipher clerk whose 1945 disclosure of a mole in MI5 touched off the Cold War. With a mass of new evidence, some from Russian sources, Pincher also provides exciting new perspectives on other infamous operatives, including Kim Philby and Klaus Fuchs. Perhaps most explosively, Pincher posits that long after Hollis stepped down, a cover-up was perpetrated at the highest levels, even involving Margaret Thatcher, to conceal the truth for ever – a deception that continues today. Treachery warns us to protect our society and institutions from enemy infiltration in the future. It is a revelatory work that puts twentieth-century politics and war into stunning new relief.

Review: As a youngster during the second World War, one abiding memory was the arrival each week of the Sunday Express. Two matters concerned my parents. The first was the latest cartoon by Giles featuring Grandma, always equipped with a large brolly with which she would attack all who got in her way. The second was the latest revelation by Chapman Pincher. For some time, I speculated that Mr Pincher actually was Grandma and got his facts while sneaking round Whitehall so disguised. Joking aside, Mr Pincher has been banging on about Roger Hollis for 50 years and more. Here are the reasons. Here also the litany of cover ups, obfuscations and incompetencies with which MI5 has sought to deter further investigation.

This is essential reading for those wanting a complete view of the arguments on both sides. It should be noted that the value of the work is strengthened by the ability to resist going further than “it is likely” and “it is probable” where definitive proof has not been declassified or, indeed, lies among the many thousands of documents which have been destroyed. For readers considering the actual value to the nation of more recent work by our security services this book provides food for thought, and will encourage research as Chilcot reports, assuming the government allows publication of the many documents the enquiry has seen but is currently not being allowed to report upon or publish

Chapman Pincher is one of the most experienced and best-known British espionage writers. For decades, he has been the most effective critic of the British security system, breaking scores of stories that have created headlines.