“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!”

“You must obtain the release of young Neligan as soon as possible,” said Holmes. “I confess that I think you owe him some apology. The tin box must be returned to him, but, of course, the securities which Peter Carey has sold are lost forever. There’s the cab, Hopkins, and you can remove your man. If you want me for the trial, my address and that of Watson will be somewhere in Norway - I’ll send particulars later.”