“Now I’ll tell you the queerest part of the whole story. I had hardly got outside the hut when I heard someone coming, and I hid among the bushes. A man came slinking along, went into the hut, gave a cry as if he had seen a ghost, and legged it as hard as he could run until he was out of sight. Who he was or what he wanted is more than I can tell. For my part I walked ten miles, got a train at Tunbridge Wells, and so reached London, and no one the wiser.

“Well, when I came to examine the box I found there was no money in it, and nothing but papers that I would not dare to sell. I had lost my hold on Black Peter and was stranded in London without a shilling. There was only my trade left. I saw these advertisements about harpooners, and high wages, so I went to the shipping agents, and they sent me here. That’s all I know and I say again that if I killed Black Peter, the law should give me thanks, for I saved them the price of a hempen rope.”

“A very clear statement,” said Holmes, rising and lighting his pipe. “I think, Hopkins, that you should lose no time in conveying your prisoner to a place of safety. This room is not well adapted for a cell, and Mr. Patrick Cairns occupies too large a proportion of our carpet.”

“Mr. Holmes,” said Hopkins, “I do not know how to express my gratitude. Even now I do not understand how you attained this result.”

“Simply by having the good fortune to get the right clue from the beginning. It is very possible if I had known about this notebook it might have led away my thoughts, as it did yours. But all I heard pointed in the one direction. The amazing strength, the skill in the use of the harpoon, the rum and water, the sealskin tobacco-pouch with the coarse tobacco — all these pointed to a seaman, and one who had been a whaler. I was convinced that the initials ‘P. C.’ upon the pouch were a coincidence, and not those of Peter Carey, since he seldom smoked, and no pipe was found in his cabin. You remember that I asked whether whisky and brandy were in the cabin. You said they were. How many landsmen are there who would drink rum when they could get these other spirits? Yes, I was certain it was a seaman.”

“And how did you find him?”

“My dear sir, the problem had become a very simple one. If it were a seaman, it could only be a seaman who had been with him on the Sea Unicorn. So far as I could learn he had sailed in no other ship. I spent three days in wiring to Dundee, and at the end of that time I had ascertained the names of the crew of the Sea Unicorn in 1883. When I found Patrick Cairns among the harpooners, my research was nearing its end. I argued that the man was probably in London, and that he would desire to leave the country for a time. I therefore spent some days in the East End, devised an Arctic expedition, put forth tempting terms for harpooners who would serve under Captain Basil — and behold the result!”

“Wonderful!” cried Hopkins. “Wonderful!”