Soon after six o'clock in the evening of the day that I had attended the dinner, a Mr. Wilberforce had caught me in flagrante delicto with his wife in the bedroom of their flat in Bayswater. He had forced me to give him my name and address, and a woman who cleaned for them was prepared to give evidence that, not only had she let me into the flat that evening, but had also done so on two previous occasions. The fact, as I learned later, that Mrs. Wilberforce was a woman of dubious reputation, who frequented night-clubs, made no difference to the legal aspect of the matter. As I had arrived in London that evening at five o'clock and spent the best part of the next two hours watching a film that I had particularly wanted to see, I could produce no alibi.

The only possible explanation was that Lothar, having read my mind and knowing my intentions, had impersonated me with this woman before going down to Farnborough, as a means of being further revenged upon me.

Hardly able to contain myself for fury, I jumped into a taxi and drove straight to Lothar's rooms. This time the front door was shut. My ring was answered by a blowsy woman who gave me a surly nod and said:

'Hello Mr. Vintrex, I'd begun to think you wasn't coming for that envelope you left with me. Hang on half-a-mo', and I'll go and get it for you.'

It was obvious that she took me for Lothar, so I let her continue to think so, and she slouched off down into the basement. The moment she had disappeared I tried the door of the room in which I had seen him. It opened at my touch and I walked in on the off chance that I might find something there which would give me a clue to his whereabouts.

A young man with long hair was seated there tapping away at a typewriter. I asked quickly if he happened to know the address of the previous tenant and how long it was since he had left. With a shrug, he replied, 'No, I don't even know his name. But I've been here a fortnight.'

I thanked him and backed out just in time to meet the landlady as she reappeared up the basement stairs. She handed me an envelope and with a murmur of thanks I left the house.

It had jumped to my mind that Lothar had left some paper with the woman because he thought it too dangerous to carry about with him, so he was still in this country and, with luck, it might be something which would enable me to trace him; or, rather, enable the police to do so, as, by then, I had made up my mind to put them on to him as an enemy agent.