'Wu Ling made the journey to England in the S.S. Assunta, and the Assunta docked at Southampton on a cold, foggy morning in November. One of the directors, Mr Pearson, went down to Southampton to meet the boat, but owing to the fog, the train down was very much delayed, and by the time he arrived, Wu Ling had disembarked and left by special train for London. Mr Pearson returned to town somewhat annoyed, as he had no idea where the Chinaman proposed to stay. Later in the day, however, the offices of the company were rung up on the telephone. Wu Ling was staying at the Russell Square Hotel. He was feeling somewhat unwell after the voyage, but declared himself perfectly able to attend the board meeting on the following day.

'The meeting of the board took place at eleven o'clock. When half past eleven came, and Wu Ling had not put in an appearance, the secretary rang up the Russell Hotel. In answer to his inquiries, he was told that the Chinaman had gone out with a friend about half past ten. It seemed clear that he had started out with the intention of coming to the meeting, but the morning wore away, and he did not appear. It was, of course, possible that he had lost his way, being unacquainted with London, but at a late hour that night he had not returned to the hotel. Thoroughly alarmed now, Mr Pearson put matters in the hands of the police. On the following day, there was still no trace of the missing man, but towards evening of the day after that again, a body was found in the Thames which proved to be that of the ill-fated Chinaman. Neither on the body, nor in the luggage at the hotel, was there any trace of the papers relating to the mine.

'At this juncture, mon ami, I was brought into the affair. Mr Pearson called upon me. While profoundly shocked by the death of Wu Ling, his chief anxiety was to recover the papers which were the object of the Chinaman's visit to England. The main anxiety of the police, of course, would be to track down the murderer - the recovery of the papers would be a secondary consideration. What he wanted me to do was to co-operate with the police while acting in the interests of the company.

'I consented readily enough. It was clear that there were two fields of search open to me. On the one hand, I might look among the employees of the company who knew of the Chinaman's coming; on the other, among the passengers on the boat who might have been acquainted with his mission. I started with the second, as being a narrower field of search. In this I coincided with Inspector Miller, who was in charge of the case - a man altogether different from our friend Japp, conceited, ill-mannered and quite insufferable. Together we interviewed the officers of the ship. They had little to tell us. Wu Ling had kept much to himself on the voyage. He had been intimate with but two of the other passengers - one a broken-down European named Dyer who appeared to bear a somewhat unsavoury reputation, the other a young bank clerk named Charles Lester, who was returning from Hong Kong. We were lucky enough to obtain snapshots of both these men. At the moment there seemed little doubt that if either of the two was implicated, Dyer was the man. He was known to be mixed up with a gang of Chinese crooks, and was altogether a most likely suspect.