‘I followed up my invitation. Why not do so? I have never married. I have never, therefore, known the delights (if such they are) of the marriage-bed. Overrated as I have frequently considered them, the illicit lure of sexual delights will almost always be a potential attraction to an old, unhonoured person like myself. (I don’t think we have a hanging participle in the previous sentence.) And lascivious thoughts, albeit occasional ones, are not wholly alien even from such a dryasdustest man as me.

‘Where are we then? Ah, yes. I went. I went through the doors that had been clearly labelled for my attention, and I knew where I was going; I knew exactly. It will be of little value to you so have a comprehensive account of subsequent events, although (to be fair to myself) they were not particularly sordid. The whole drama (I must admit it) was played with a carefully rehearsed verisimilitude, with myself acting a role that was equally carefully rehearsed. Yet at one stage (if I may continue -themetaphor), I forgot my lines completely. And so, perhaps, would you have done. For a devastatingly lovely woman-a Siren fit to beguile the wily Ulysses himself- was almost, almost rob me of my robe of honour; and, perhaps more importantly to rob me of my one defence-an army revolver which I had kept since my days in the desert, and which was even now still bulging reassuringly in my jacket-pocket.

‘But things are getting out of sequence, and we must go back. Who was the man I had seen on Staircase T at Lonsdale College? You will have to know. Yes, I am afraid you will have to know.

‘I was a young officer in the desert during the battle of El Alamein. I was, I think, a good officer, in the sense that I tried to look after the men in my charge, left little to needless chance, enforced the orders I was given and faced the enemy with the conviction that this conflict-this one, surely-was as fully justified as any in the, annals of Christendom. But I knew one thing that no one else could know. I knew that at heart I was a physical coward; and I always feared the thought that, if there were to come a time when I should be called upon to show a personal, an individual-as against a communal, corporate-act of courage, well, I knew that I would fail. And that moment came. And I failed. It came-I need not relate the shameful details-when a man pleaded with me to risk my own life in trying to save the life of a man who was trapped in a fiercely burning tank. But enough of that. It hurts me deeply, even now, to recall my cowardice.

‘Let us now switch forward again. It was all phoney: I soon began to realize that. There were those two bottles of everything, for example: two of them-in whatever the client (in this case, me) should happen to indulge. Why two? The one of them about two thirds empty (or is it one third full?); the other completely intact, with the plastic seal fixed round its top. Why go, then, to the new bottle for the first, perfunctory drinks? I didn’t know, but I soon began to wonder. And then her accent! Oh dear! Had she been at an audition, any director worth a tuppence of salt would have told her to flush her Gallic vowels down the nearest ladies’ lavatory. And then at one point she opened her handbag-a handbag she must have owned for twenty years. A professional whore with an aged handbag? And not only that. She was introduced to me by an unconvincing old hag as “Yvonne”; so why are the faded gilt initials on the inside flap of her handbag clearly printed “W.S.”? You see where all this suspicion is leading? But I had my revolver. I was going to be all right. I was all right. (How I hate underlining words in typescript- but often it is necessary.) It was only when this lovely girl (oh dear, she was lovely!) poured my final drink from the other bottle (not the bottle I had drunk from before) that I knew exactly what my situation was. I asked her to open the curtains a little, and whilst she was doing this I poured the (doubtless doctored) contents of my glass inside my trousers, in order that the impression should be given that I had been incapable of controlling myself. (I know you will understand the sense of what, so delicately, I have tried to express.) You must understand that at this point she was quite openly and wantonly naked, and I myself quite justifiably aroused.

‘After that? If I may say so, I performed my part professionally. Making vaguely somnolent noises, I now assumed the role of a man (as the Americans have it) in a totally negative response situation. Then the woman left me; and after hearing whispered communications on the other side of the door, I sensed that someone else was in the room. Let us leave it there.

‘I am getting tired with this lengthy typing, but it is important that I should go on a little longer.

‘You were a fool when you were an undergraduate-wasting, as you did, the precious talent of a clear, clean mind. It was me (or do you prefer “I”?) who marked some of your Greats papers, and even amidst the widespread evidence of your appalling ignorance there were moments of rare perception and sensitivity. But since that time you have made a distinguished reputation for yourself as a man of the Detective (as Dickens has it), and I was anxious that it should be a worthy brain that was to be pitted against my own. Why else should the body be discovered where it was? Who made sure that it should be found at Thrupp-a place almost in your own back-yard? You will, I suspect, have almost certainly discovered by now why I was not able to leave the head and the hands for your inspection? Yes, I think so. You would have been quite certain that it was not my body had I done so, and I wished to sharpen up your brain, for (believe me!) it will need to be as sharp as the sword of Achilles before your work is finished. Here then is a chance for you to show the sort of quality that was apparent in your early days at Oxford. Perhaps this case of yours will afford for you the opportunity to kill an ancient ghost, since I shall quite certainly (albeit posthumously) award you a “first” this time if you can grasp the inevitable (and basically so simple) logic of all these strange events.

‘I shall make no further communication to you; and I advise you not to try to track me down, for you will not find me.

‘Post Scriptum. I have just read this letter through and wish to apologize for the profusion of brackets. (I am not often over-influenced by the work of Bernard Levin.)’

Investigations proceed with a nominal line drawn down the middle of needful inquiries.

So many clues now, and as Morse and Lewis saw things there were four main areas of inquiry:

1. What were the real facts about that far-off day in the desert when Browne-Smith had faced his one real test of character-and (apparently) failed so lamentably?

2. Where exactly did Westerby (a name cropping up repeatedly now) fit into the increasingly complex pattern?

3. Who was the person whom Browne-Smith had met after his anti-climactic sexual encounter with the pseudonymous “Yvonne”?

4. And (still, to Morse the most vital question of all) whose was the body they had found?

Obviously the strands of these inquiries would interweave at many points; but it seemed sensible to the two detectives that each should make his own investigations for a day or two, with Lewis concentrating his attentions on the first two areas, and Morse on the second two.

Lewis spent most of the morning on the telephone, ringing,