integrated into the village community that both her parents, who were frequent visitors in Oxfordshire even after the war ended, and who both died in 1947, are buried in the Great Rollright churchyard. In each Oxfordshire property in which she lived Agent Sonya installed a radio receiver and transmitter (which during the war was illegal). Living in Oxfordshire placed them conveniently close to her parents who had emigrated to London after 1933, and were then living with friends in Oxford because of the air raids in London. The Beurtons' Oxfordshire village homes were also close to the UK's Atomic Research Centre at Harwell, and to Blenheim Palace, where a large part of the British intelligence service had been relocated at the start of the war. In Oxfordshire, together with Erich Henschke, she worked on infiltrating German Communist exiles into the US Intelligence Agency. By Autumn 1944 she and Henschke had succeeded in penetrating UK activities of the US Intelligence Service (OSS). The Americans were at this time preparing "Operation Hammer" for parachuting UK-based German exiles into Germany. Ursula Beurton was able to ensure that a substantial number of the parachuted OSS agents would be reliable communists, able and willing to make inside intelligence from the "Third Reich" available not merely to the US military in Washington, but also to Moscow. From 1943 she also worked as a courier for the USSR's "Atomic spies", Klaus Fuchs and Melita Norwood. Agent Sonya thus hastened the development of the Soviet atomic bomb, successfully tested in 1949. In addition to the (retrospectively) high-profile spies Klaus Fuchs and Melita Norwood, Sonya was the GRU handler for (among others) an officer of the British Royal Air Force and a British specialist in submarine radar. She was also able to pass to her Soviet employers information from her brother, her father, and other exiled Germans in England. It was, indeed, her brother Jürgen Kuczynski, an internationally respected economist, who originally recruited Fuchs to spy for the Soviets at the end of 1942. Many years later Ruth Werner (as she would by that time have become known) recalled that she was twice visited by MI5 representatives in 1947, and asked about her links with Soviet intelligence, which Werner refused to discuss. Werner's communist sympathies were no secret, but it seems that British suspicions were insufficiently supported by evidence to justify her arrest. Her visitors were unaware of or