George Blake was the last remaining Cold War spy. As a Senior Officer in the British Intelligence Service who was double agent for the Soviet Union, his actions had devastating consequences for Britain. Yet he was also one of the least known double agents, and remained unrepentant. In 1961, Blake was sentenced to forty-two years imprisonment for betraying to the KGB all of the Western operations in which he was involved, and the names of hundreds of British agents working behind the Iron Curtain. This illuminating biography tracks Blake from humble beginnings as a teenage courier for the Dutch underground during the Second World War, to the sensational prison-break from Wormwood Scrubs that inspired Hitchcock to write screenplay.