Their Trade is Treachery Chapman Pincher: The Book That Accused MI5's Own Director of Spying for Moscow
He Ran MI5. Chapman Pincher Said He Worked for the KGB. Britain Never Fully Recovered.
Some books shake the establishment. Most just annoy it. This one did both — and then some.
When Chapman Pincher published Their Trade is Treachery in 1981, Britain went into shock. Not the quiet kind. The loud, Parliamentary, who-told-him-that kind. Because Pincher didn't just write about spies in the Cold War. He pointed his finger at Roger Hollis — the former Director-General of MI5 — and said the man who ran Britain's security service had been working for Moscow.
Let that land for a second.
The head of MI5. A Soviet mole.
I've read a lot of spy books. Cambridge Five stuff. Gordievsky. Spycatcher by Peter Wright. And this one sits right alongside all of them. But it hits differently because of who it targets. Not some junior officer. Not an outsider who slipped through the vetting. The top man.
Pincher was a journalist at the Daily Express. He made a career out of knowing more than the government wanted him to. Prime Ministers hated him. Which usually meant he was onto something. And with this book, he used leaks, inside sources, and quiet conversations with people who had served inside the intelligence world to build his case.
His argument runs like this. Too many Cold War intelligence failures happened in the years Hollis ran MI5. Not bad luck. Not poor judgment. A pattern. Operations that blew up. Sources that got burned. The same kind of consistent failures that you'd expect if someone at the top was feeding information to the other side.
Can you sit with that idea for a moment? An agency built to catch spies — and its own director might have been one of them.
Now here's what I want to be straight about. Pincher doesn't prove it. He couldn't. He didn't have the files. He relied on informed suspicion, inside sources, and a pattern of failures. Some of his critics hit back hard. They said he ran too far ahead of his evidence. And they had a point.
But here's the thing. The questions he raised didn't go away. Peter Wright — the MI5 officer who wrote Spycatcher — believed the same thing about Hollis. The two men knew each other. Wright gave Pincher access to his thinking. And the overlap between this book and Spycatcher is real and sharp. If you've read Wright, reading Pincher makes everything land harder.
Pincher also covers the Cambridge Five — Philby, Burgess, Maclean, Blunt — and asks whether Britain had truly understood the full scope of Soviet infiltration. His answer is no. He argues that the damage went deeper than the public record showed. And given what came out in later years, that argument holds up better than his critics expected.
The writing style is direct. Pincher writes like the journalist he was — fast, clear, and with urgency. He doesn't drown you in footnotes. He moves. Some readers want more sourcing, and I get that. But the pace of this book is part of what made it explode when it came out. It felt like someone had finally put the suspicions of a generation into print.
I gave this four stars on Goodreads. It's not perfect. The evidence is thin in places and Pincher occasionally pushes harder than the facts support. But as a document of Cold War British anxiety — the fear that the enemy had already won from the inside — it's essential. It captures a moment when Britain looked at its own security service and genuinely didn't know who to trust.
If you've worked your way through the Cambridge spy books and Spycatcher and want one more view of this world — the journalist's view, the outsider who somehow got inside — this is the one to read next.
Four stars. A landmark book that forced Britain to ask a question it still hasn't answered with complete confidence. Was Roger Hollis guilty?
Nobody knows. Pincher made sure we'd keep asking.
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