"You didn't by any chance see anyone walking this way last night?" I asked. "A tall man, grey-haired, carrying a stick?"

He shook his head. "We don't get many visitors coming here," he said. "Doesn't lead anywhere, just to this farm. Visitors stay mostly on Par beach."

I thanked him and walked back to the car. I was not convinced, though.

He could have been indoors between half-past eight and nine; Magnus could be lying in the marsh below his farm… But surely someone would have seen him? The effect of the drug, if he had taken it, would have worn off hours ago; if he had taken it at half-past eight, or nine, he would have come to by ten, by eleven, by midnight.

There was a police car drawn up outside the house when I arrived, and as I entered the hall I heard Vita say, "Here's my husband now."

She was in the music-room with a police officer and a constable.

"I'm afraid we've no definite news for you, Mr. Young," the Inspector said, "only a slight clue, which may lead us to something. A man answering to the description of Professor Lane was seen last evening between nine and half-past walking along the Stonybridge lane above Treesmill past Trenadlyn Farm."

"Trenadlyn Farm?" I repeated, and the surprise must have shown in my face, for he said quickly, "You know it, then?"

"Why, yes," I said, "it's much higher up the valley than Treesmill, it's the small farm right on the lane itself."

"That's right. Have you any idea why Professor Lane should have been walking in that particular direction, Mr. Young?"

"No," I said with hesitation. "No… There was nothing to take him there. I would have expected him to be walking lower down the valley, nearer to Treesmill."

"Well," the Inspector replied, "our information is that a gentleman was seen walking past Trenadlyn between nine and half-past. Mrs. Richards, wife of Mr. Richards who owns the farm, saw him from her window, but her brother, who farms Great Treverran, higher up the lane, saw no one. If Professor Lane was walking to Kilmarth it seems a long way round, even for someone who wanted exercise after sitting in a train."

"Yes, I agree. Inspector," I went on hesitantly, "Professor Lane is very interested in historical sites, and this may have been the reason for his walk. I think he was looking for an old manor house which he believes stood there once. But it couldn't have been either of the farms you mentioned, or he would have called at one of them." I knew now why Magnus — and it must have been Magnus, from the woman's description — was walking past Trenadlyn on the Stonybridge lane. It was the route Isolda had taken on horseback with Robbie, when the two of them had come riding down to Treesmill to the creek, to find Bodrugan murdered, drowned. It was the only route to the unknown Tregest when the ford across Treesmill was impassable through flood or high tide. Magnus, when he passed Trenadlyn farm, was walking in time. He could have been following Roger, and Isolda too.

Vita, unable to contain herself, turned to me impulsively. "Darling, all this historical business is beside the point. Please don't be angry with me for butting in, but I feel it's essential." She turned to the Inspector. "I'm quite sure, and so was my husband last night, that the Professor was going to call on some old friends of his, people called Carminowe. Oliver Carminowe is not on the telephone, but he does live somewhere in that district, where the Professor was last seen. It's quite obvious to me that he was on his way to call on them, and the sooner somebody contacts them the better."

There was a momentary silence after her outburst. Then the Inspector glanced at me. His expression had changed from concern to surprise, even disapproval.

"Is that so, Mr. Young? You said nothing about the possibility of Professor Lane visiting friends."

I felt my mouth flicker in a weak smile. "No, Inspector," I said, "of course not. There was no question of the Professor visiting anyone. I'm afraid my wife had her leg pulled over the telephone by the Professor, and I very foolishly did nothing to put her wise, but kept up the joke. There are no such people as Carminowe. They don't exist."

"Don't exist?" echoed Vita. "But you saw the children riding ponies on Sunday morning, two little girls with their nurse, you told me so."

"I know I did," I said, "but I can only repeat I was pulling your leg."

She stared at me in disbelief. I could tell, from the expression in her eyes, that she thought I was lying to get Magnus and myself out of an awkward situation. Then she shrugged her shoulders, flicked a rapid glance at the Inspector and lit a cigarette. "What a very stupid joke," she said, and added, "I beg your pardon, Inspector."

"Don't apologise, Mrs. Young," he said, rather more stiffly, I thought, than before. "We all get our legs pulled from time to time, especially in the police force. He turned again to me. You're quite certain about that, Mr. Young? You know of no one whom Professor Lane might have been calling upon after he arrived at Par station?"

"Absolutely not," I said. "As far as I know we are his only friends here, and he was definitely coming to spend the weekend with us. The house belongs to him, as you know. He's lent it to us for the summer holidays. Quite frankly, Inspector, I was not really concerned about Professor Lane until this morning. He knows the district well, for his father, Commander Lane, had this house before him. I was sure he couldn't lose himself, and that he'd turn up with some plausible explanation of where he had been all night."

"I see," said the Inspector. Nobody said anything for a moment, and I had the impression that he doubted my story, just as Vita did, and that they both thought Magnus had been bound on some doubtful assignation and I was covering up for him. Which, indeed, was true.

"I realise now", I said, "that I should have got in touch with you last night. Professor Lane must have twisted his ankle, probably shouted for help, and nobody heard. There wouldn't have been much traffic up that side road once it was dark."

"No," the Inspector agreed, "but the people from Trenadiyn and Treverran would have been astir early this morning, and should have seen or heard something of him by now, if he had had some mishap on the road. More likely he walked up to the main road, and then he could have taken either direction, on towards Lostwithiel or back to Fowey."

"The name Tregest doesn't convey anything to you?" I asked cautiously.

"Tregest?" The Inspector thought a moment, then shook his head. "No, I can't say it does. Is it the name of a place?"

"I believe there was a farm of that name once, somewhere in the district. Professor Lane could have been trying to find it, in connection with his historical research." Then I suddenly had another idea. "Trelawn," I said, "where exactly is Trelawn?"

"Trelawn?" repeated the Inspector, surprised. "That's an estate a few miles from Looe. Must be eighteen miles or more from here. Professor Lane would surely not start to try to walk there around nine o'clock at night?"

"No," I said, "no, of course not. It's just that I'm trying to think of old houses of historical interest."

"Yes, but, darling," interrupted Vita, "as the Inspector says, Magnus would hardly start looking for something of that sort, miles away, without telephoning us first. That's what I can't understand, why he didn't attempt to telephone."

"He didn't telephone, Mrs. Young," said the Inspector, "because he apparently thought Mr. Young would know where he was going."

"Yes," I said, "and I didn't know. I don't know now. I only wish to God I did."

The telephone rang with startling suddenness, like an echo to all our thoughts. "I'll get it," said Vita, who was nearest to the door. She crossed the hall to the library, and we stood there in the music-room saying nothing, listening to her voice.

"Yes," she said briefly, "he is here. I'll get him." She came back into the room and told the Inspector that the call was for him. We waited for what seemed an interminable three or four minutes, while he answered in monosyllables, his voice muffled. I looked at my watch. It was just on half-past twelve. I had not realised it was so late. When he returned he looked directly at me, and I saw from the expression on his face that something had happened.

"I'm very sorry, Mr. Young," he said, "I'm afraid it's bad news."

"Yes," I said, "tell—"

One is never prepared. One always believes, in moments of acute stress, that things will turn out all right, that even now, with Magnus missing for so long, it would surely be to say that someone had picked him up with loss of memory and taken him to hospital. Vita came and stood beside me, her hand in mine.

"That was a message from Liskeard police station," said the Inspector. "Word has come through that one of our patrols has found the body of a man resembling Professor Lane near the railway-line just this side of Treverran tunnel. He seems to have received a blow on the head from a passing train, unobserved by the driver or the guard. He managed, apparently, to crawl into a small disused hut just above the line, and then he collapsed. It looks as if he must have been dead for some hours." I went on standing there, staring at the Inspector. Shock is a peculiar thing, numbing emotion. It was as though life itself had ebbed away, leaving me a shell, like Magnus. I was only aware of Vita holding my hand.

"I understand," I said, but it was not my voice. "What do you want me to do?"

"They are on their way to the mortuary in Fowey now, Mr. Young," he said. "I hate to trouble you at such a moment, but I think it would be best if we took you there right away to identify the body. I should like to think, for both your sakes, yours and Mrs. Young's, that it is not Professor Lane, but in the circumstances I can't offer you much hope."