When Vermehren returned to
Berlin on leave, the couple agreed they would defect to Britain. So that Elisabeth could travel to Istanbul, she procured an official assignment from the Foreign Office in connection with the Archbishop's visit to Turkey. They travelled by train to Istanbul, but at the border crossing into
Bulgaria, Elisabeth was arrested by Gestapo agents and taken to the German embassy in
Sofia, though Vermehren was permitted to continue to Istanbul. In Sofia, the ambassador was a family friend who (in cooperation with the Abwehr station chief) sneaked her on board a diplomatic courier plane to Istanbul. Meanwhile, Erich had made overtures to the British
Secret Intelligence Service, which already had a file on him, through its
counter-espionage representative
Nicholas Elliott. The couple received word that a friend from the Foreign Office,
Otto Carl Kiep, had been arrested on 12 January 1944 in connection with his attendance at the
Frau Solf Tea Party. The Gestapo summoned them to Berlin in connection with the case, but anticipating what was in store for them, they refused, and defected in early February 1944. In the hope that their families would be protected from
Sippenhaft (detention for the crimes of a family member) as a result of their defection, their defection was made to appear to be a kidnapping by the British. The Vermehrens were smuggled to England via
İzmir,
Aleppo,
Cairo and
Gibraltar. British
propaganda organisations broke the news of the defection, knowing that it would cause havoc in Germany's intelligence services, especially since the
invasion of Western Europe was imminent. It was believed that he had absconded with the Abwehr's secret codes. This was untrue, but according to British records, Vermehren nevertheless gave much valuable information to the Allies about German intelligence operations. Hitler now distrusted the Abwehr and Canaris, and on 18 February 1944 the Abwehr was abolished and its intelligence functions taken over by the
SS Security organisation (RSHA), under the jurisdiction of
Heinrich Himmler. Several members of the couple's families were arrested and interned, including Erich's parents, his elder brother Michael and sister
Isa Vermehren, and Elisabeth's youngest sister Gisela. All of them survived the war. Isa wrote of her time in prison camps in the book,
A Journey through the Final Act: Ravensbrück, Buchenwald, Dachau: A Woman Reports. == In England ==