"I now decided to conduct a third interview with Mrs. Fennan. She broke down and confessed to having acted as an intelligence courier for her husband, who had been recruited by Frey on a skiing holiday five years ago. She herself had co-operated unwillingly, partly in loyalty to her husband and partly to protect him from his own carelessness in performing his espionage role. Frey had seen Fennan talking to me in the park. Assuming I was still operationally employed, he had concluded that Fennan was either under suspicion or a double agent. He instructed Mundt to liquidate Fennan, and his wife had been compelled into silence by her own complicity. She had even typed the text of the suicide letter on Fennan's typewriter over a specimen of her husband's signature.
"The means whereby she passed to Mundt the intelligence procured by her husband is relevant. She placed notes and copied documents in a music case, which she took to the theatre. Mundt brought a similar case containing money and instructions and, like Mrs. Fennan, left it in the cloakroom. They had only to exchange cloakroom tickets. When Mundt failed to appear at the theatre on the night in question, Mrs. Fennan obeyed standing instructions and posted the ticket to an address in Highgate. She left the theatre early in order to catch the last post from Weybridge. When later that night Mundt demanded the music case she told him what she had done. Mundt insisted on collecting the case that night, for he did not wish to make another journey to Weybridge.
"When I had interviewed Mrs. Fennan the following morning, one of my questions (about the 8.30 call) alarmed her so much that she telephoned Mundt. This accounts for the assault upon me later that day.
"Mrs. Fennan provided me with the address and telephone number she used when contacting Mundt — whom she knew by the cover name of Freitag. Both led to the apartment of a 'Lufteuropa' pilot who often entertained Mundt and provided accommodation for him when he required it. The pilot (presumably a courier of the East German Intelligence Service) has not returned to this country since 5th January.
"This, then, was the sum of Mrs. Fennan's revelations, and in a sense they led nowhere. The spy was dead, his murderers had vanished. It only remained to assess the extent of the damage. An official approach was now made to the Foreign Office and Mr. Felix Taverner was instructed to calculate from Foreign Office schedules what information had been compromised. This involved listing all files to which Fennan had had access since his recruitment by Frey. Remarkably, this revealed no systematic acquisition of secret files. Fennan had drawn no secret files except those which directly concerned him in his duties. During the last six months, when his access to sensitive papers was substantially increased, he had actually taken home no files of secret classification. The files he took home over this period were of universally low grade, and some treated subjects actually outside the scope of his section. This was not consistent with Ferman's role as a spy. It was, however, possible that he had lost heart for his work, and that his luncheon invitation to me was a first step to confession. With this in mind he might also have written the anonymous letter which could have been designed to put him in touch with the Department.
"Two further facts should be mentioned at this point. Under an assumed name and with a false passport, Mundt left the country by air on the day after Mrs. Fennan made her confession. He evaded the notice of the airport authorities, but was retrospectively identified by the air hostess. Secondly, Ferman's diary contained the full name and official telephone number of Dieter Frey — a flagrant breach of the most elementary rule of espionage.
"It was hard to understand why Mundt had waited three weeks in England after murdering Scarr, and even harder to reconcile Fennan's activities as described by his wife with the obviously unplanned and unproductive selection of files. Re-examination of the facts led repeatedly to this conclusion: the only evidence that Fennan was a spy came from his wife. If the facts were as she described them, why had she been allowed to survive the determination of Mundt and Frey to eliminate those in possession of dangerous knowledge?
"On the other hand, might she not herself be the spy?
"This would explain the date of Mundt's departure: he left as soon as he had been reassured by Mrs. Fennan that I had accepted her ingenious confession. It would explain the entry in Ferman's diary: Frey was a chance skiing acquaintance and an occasional visitor to Walliston. It would make sense of Ferman's choice of files — if Fennan deliberately chose unclassified papers at a time when his work was mainly secret there could be only one explanation: he had come to suspect his wife. Hence the invitation to Marlow, following naturally upon our encounter the previous day. Fennan had decided to tell me of his apprehensions and had taken a day's leave to do so — a fact of which his wife was not apparently aware. This would also explain why Fennan denounced himself in an anonymous letter: he wished to put himself in touch with us as a preliminary to denouncing his wife.
"Continuing the supposition it was remarkable that in matters of tradecraft Mrs. Fennan alone was efficient and conscientious. The technique used by herself and Mundt recalled that of Frey during the war. The secondary arrangement to post the cloakroom ticket if no meeting took place was typical of his scrupulous planning. Mrs. Fennan, it seemed, had acted with a precision scarcely compatible with her claim to be an unwilling party to her husband's treachery.
"While logically Mrs. Fennan now came under suspicion as a spy, there was no reason to believe that her account of what happened on the night of Ferman's murder was necessarily untrue. Had she known of Mundt's intention to murder her husband she would not have taken the music case to the theatre, and would not have posted the cloakroom ticket.
"There seemed no way of proving the case against her unless it was possible to reactivate the relationship between Mrs. Fennan and her controller. During the war Frey had devised an ingenious code for emergency communication by the use of snapshots and picture postcards. The actual subject of the photograph contained the message. A religious subject such as a painting of a Madonna or a church conveyed a request for an early meeting. The recipient would send in reply an entirely unrelated letter, making sure to date it. A meeting would take place at a prearranged time and place exactly five days after the date on the letter.
"It was just possible that Frey, whose tradecraft had evidently altered so little since the war, might have clung to this system — which, after all, would only seldom be needed. Relying on this I therefore posted to Elsa Fennan a picture postcard depicting a church. The card was posted from Highgate. I hoped somewhat forlornly that she would assume it had come to her through the agency of Frey. She reacted at once by sending to an unknown address abroad a ticket for a London theatre performance five days ahead. Mrs. Ferman's communication reached Frey, who accepted it as an urgent summons. Knowing that Mundt had been compromised by Mrs. Fennan's 'confession' he decided to come himself.
"They therefore met at the Sheridan Theatre, Hammersmith, on Thursday, 15th February.
"At first each assumed that the other had initiated the meeting, but when Frey realised they had been brought together by a deception he took drastic action. It may be that he suspected Mrs. Fennan of luring him into a trap, that he realised he was under surveillance. We shall never know. In any event, he murdered her. His method of doing this is best described in the coroner's report at the inquest: 'a single degree of pressure had been applied on the larynx, in particular to the horns of the thyroid cartilage, causing almost immediate death. It would appear that Mrs. Ferman's assailant was no layman in these matters?
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