There were very few people upon Platform Number Twenty-one of Liverpool Street Station at a quarter to nine on the evening of April 2—possibly because the platform in question is one of the most remote and least used in the great terminus. The station-master, however, was there himself, with an inspector in attendance. A dark, thick-set man, wearing a long travelling ulster and a Homburg hat, and carrying in his hand a brown leather dressing-case, across which was painted in black letters the name MR. JOHN P. DUNSTER, was standing a few yards away, smoking a long cigar, and, to all appearance absorbed in studying the advertisements which decorated the grimy wall on the other side of the single track. A couple of porters were seated upon a barrow which contained one solitary portmanteau. There were no signs of other passengers, no other luggage. As a matter of fact, according to the time-table, no train was due to leave the station or to arrive at it, on this particular platform, for several hours. Down at the other end of the platform the wooden barrier was thrust back, and a porter with some luggage upon a barrow made his noisy approach. He was followed by a tall young man in a grey tweed suit and a straw hat on which were the colours of a famous cricket club.