A glamorous suspected German agent caused a scandal when she developed a "most undesirable familiarity" with British intelligence officers in Cairo during World War II, according to MI5 files.
One married UK officer asked Sophie Kukralova to be his wife and a second threatened to have her arrested as a spy unless she slept with him, according to newly declassified documents.
Ms Kukralova was arrested and interned by the British in Palestine during the war after arousing suspicion for her close interest in military matters, unexplained wealth and claims of top-level links to the Nazi regime.
A March 1944 report to MI5 notes there is no definite proof she was a German spy.
But it concludes: "With her cosmopolitan and unscrupulous character, her interest in espionage, her unusual knowledge of armaments and military affairs, Sophie would, if released, be a potential menace to security wherever she was."
Her file also records that she "acquired a most undesirable familiarity with British military personal, including at least one non-commissioned officer engaged on most secret work".
German documents uncovered by UK intelligence after the war suggested that Ms Kukralova was indeed a spy, codenamed R 37 49, who had planned to get herself adopted by UK citizens to acquire a British passport so she could travel to Bombay to arrange contacts for another Nazi agent.
She was born in Litomerice in the former Czechoslovakia in May, 1911 to Georgian exiles, her MI5 file released by the National Archives shows.
She first became involved in espionage when she worked in German weapons factories passing information to an agent from the Czech Skoda Works arms giant.
Ms Kukralova married a Czech man by the name of Havel Hama Kukraloff in 1936. They lived in Prague and then London, where she was also employed in an arms factory, before divorcing in 1937.
She was jailed five times by the Germans before turning up in the Hungarian capital of Budapest in 1941, where she befriended a London-born British engineer called Maxwell Clapham and his wife Josephine.
She persuaded the Claphams to adopt her in May 1941, although she did not get British nationality.
Later that year, she and Josephine Clapham left Budapest and travelled via Turkey and Syria to Cairo in Egypt, where they aroused "considerable suspicion" and were both arrested and interned in Palestine. British intelligence officials admitted the evidence that Ms Kukralova was a German agent was "somewhat inconclusive", but pointed to her abilities as a linguist, "morbid interest in espionage" and expressions of admiration for the Hitler regime.
She said one of her uncles had been the premier of Georgia before the 1921 Bolshevik invasion and was now the country's potential quisling, or puppet leader, for the Nazis.
In support of her being a spy, UK officers observed: "Unstable character of Sophie - an incorrigible liar, romantic, spy-complex, persecution mania."
A report on her file reads:
"Her contacts and behaviour were generally suspicious and there seems to have been some scandal in Cairo in connection with a Bob Sewell of the Intelligence Corps and an unexplained individual named Mr Flett who got drunk, tried to seduce her, and then threatened to have her arrested as a spy."
Ms Kukralova herself expanded on these incidents under interrogation. She said she met a man in Cairo called Alfred Flett who said he was Norwegian, but she believed he was a German agent because he kept trying to get stories out of her.