Dagmar Lahlum Dagmar Mohne Hansen Lahlum ( Eidsvoll , Norway , 1922 – 1999 ) was a member of the Norwegian resistance in Oslo during World War II and was later recruited ( unofficially ) to work for MI5 . Early life . The daughter of a shoe maker , Lahlum had moved to Oslo when she was 17 , shortly before the start of the war . Initially she worked as a receptionist in a city centre hotel and later took modeling classes . World War II . In April 1943 , when British double agent Eddie Chapman was drinking with German officers in The Ritz bar at Skillebekk , which also popular with members of the Norwegian national socialist party , his eye fell on the attractive Dagmar - who , complete with a décolletage and high heels - was smoking Craven A ' s with an ivory mouthpiece . When he first chatted her up , he thought that she was either a prostitute or just another good time girl ; whilst on the other hand Lahlum thought that he worked for the Germans , or was in fact a German - albeit one with an odd accent . From 1943 onwards , she became his girlfriend and later his fiancée . Troubled by the fact that she was being labelled a German whore by the locals , Chapman compromised his security during a boating trip on the fjord , when they had shared a bottle of cognac over lunch . Here he told her that he was a British double agent , and that the Germans would soon be sending him on a new mission to England . Lahlum was much relieved to hear that he worked for the British and at the same time told him about her work with the Norwegian resistance movement . When Chapman was sent back to England , Lahlum was looked after by the Germans at the insistence of Chapman and she was even paid a monthly allowance of 600 NK from the money held to his order by them and administered by Chapman ' s handler Stephan von Gröning . By the time he left for England Chapman had unofficially recruited her to MI5 and together they surveyed the German defences in and around Oslo - facts that Chapman later detailed to his English handlers upon his return . One of the sites that they reported on was the home of the Norwegian leader and traitor Vidkun Quisling . They lived together for a while in Oslo in a flat abandoned by a Jewish family killed by the Germans and later a small town house at Kapellveien 15 , also in Oslo . When Chapman returned to England , he used Lahlum ' s first name , Dagmar , as his security code in all of his radio transmissions as evidence that he was still a free agent . Although they had talked about and partly planned to open a bar or club together in Paris after the war and about having children together , when the war actually ended Chapman perhaps predictably abandoned Lahlum , who never got over their relationship . Lahlum was branded as a " German tart " for her relationship with Chapman , as the Norwegians were quite unaware that he was an Englishman . After the war . Immediately after the war ended , Lahlum worked in a bookshop and then a hairdressers and finally as an accountant . She remained single and childless , keeping her distinctive looks into old age along with her promise to Chapman never to reveal his secret . It was this honour that lead to her pleading guilty during the treason trials held in 1947 and being fined by the Norwegians , who remained in ignorance of the true situation . She died of Parkinson ' s disease in 1999 . After her death , her niece Bibbi Røset went through her papers and found a box of unsent airmail letters written in her careful English and addressed to Chapman ; Røset burned them all . This discovery and the release of previously secret British papers were the first time that her wartime past had been revealed – even to the extent that many years after the war , her neighbours would still whisper darkly that she was a German whore . Her story is partly recounted in the book " Agent Zigzag " .