The Spy Who Changed the World

In February 1950 Klaus Fuchs, the former head of theoretical physics at the British Research Establishment at Harwell was jailed for passing secrets to the Soviet Union. The trail was a hurried affair, and almost no information about what he had worked on or had given to the Russians was allowed to leak to the press. For over sixty years disinformation and lies surrounded the story of Klaus Fuchs. How brilliant a physicist was he? How vital was his spying to the Russians? When did his career as a soviet agent really begin, and how did he come to work in the most secret heart of the US and then the British nuclear weapons programme?

Piecing together the story from archives in Britain, the United States, Russia and Germany, The Spy Who Changed the World unravels the truth about Klaus Fuchs and reveals his long career of espionage, showing how he also played a pivotal role for Britain as it raced to keep up with the United States in the atomic age. It is a dramatic tale of clandestine meetings, deadly secrets, family entanglements and illicit love affairs, all set against the tumultuous years from the rise of Hitler to the start of the Cold War. The story ends with MI5’s failed attempts to trap Fuchs, and shows why, after giving away the biggest secret in the world, he finally made a carefully calculated confession.

“Opens like a Hollywood thriller” Sunday Times

“Gripping and fast paced” The Guardian

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Related words/search terms: Spy, Fuchs, atom bomb, hydrogen bomb, Los Alamos, KGB, GRU, MI5,  German Communist Party