In the final part of our spine-tingling new series by top espionage writer Ben Macintyre, we reveal how the net of the security services began to close around Soviet superspy Agent Sonya. However, thanks to the efforts of a comically inept MI5 surveillance chief, she was able to evade detention and prepared to flee back to the East . . .
Resolute: Ursula Kuczynski aka Agent Sonya lived till she was 93
The picturesque hamlet of Great Rollright in the heart of the north Oxfordshire Cotswolds was remote and exceedingly quiet when Ursula Beurton moved there with her three children in 1945, just after the end of World War II.