of the compartment. It was slightly darker than the rest of the surface, and was at the foot of the corner seat directly facing the dead man.
"I think we can fairly decide, Mr. Narkom, on the evidence of that," said Cleek, pointing to it, "that Lord Stavornell did have a companion in this compartment, and that it was the little dark man with the small moustache. Put your hand on the spot. Damp, you see; the effect of some one who had walked through the snow sitting down with his feet on this particular seat. Now look here." He passed his handkerchief over the stain, and held it out for Narkom's inspection. It was slightly browned by the operation. "Just the amount of dirt the soles of one's boots would be likely to collect if one came with wet feet along the muddy platform of the station."
"Yes; but, my dear chap, that might easily have happened—particularly on such a day as this has been—before Lord Stavornell's arrival. He can't have been the only person to enter this compartment since morning."
"Granted. But he is supposed to have been the only person who entered it after it was swept, Mr. Narkom; and that, as I told you, was done by his orders immediately before the train started. We've got past the point of 'guesswork' now. We've established the presence of the second party beyond all question. We also know that he was a person with whom Stavornell felt at ease, and was intimate enough with to feel no necessity for putting himself out by entertaining with those little courtesies one is naturally obliged to show a guest."
"How do you make that out?"
"This newspaper. He was reading at the time he was shot. You can see for yourself where the bullet went through—this hole here close to the top of the paper. When a man invites another man to occupy with him a compartment which he has engaged for his own exclusive use—and this Stavornell must have done, otherwise the man couldn't have been travelling with him—and then proceeds to read the news instead of troubling himself to treat his companion as a guest, it is pretty safe to say that they are acquaintances of long standing, and upon such terms of intimacy that the social amenities may be dispensed with inoffensively. Now look at the position of this newspaper lying between the dead man's feet. Curved round the ankle and the lower part of the calf of the left leg. If we hadn't found the key we still should have known that the murderer got out on that side of the carriage."
"How should we have known?"
"Because a paper which has simply been dropped could not have assumed that position without the aid of a strong current of air. The opening of that door on the right-hand side of the body supplied that current, and supplied it with such strength and violence that the paper was, as one might say, absolutely sucked round the man's leg. That is a positive proof that the train was moving at the time it happened, for the day, as you know, has been windless.
"Now look! No powder on the face, no smell of it in the compartment; and yet the pistol found in his hand is an ordinary American-made thirty-eight calibre revolver. We have an amateur assassin to deal with, Mr. Narkom, not a hardened criminal; and the witlessness of the fellow is enough to bring the case to an end before this night is over. Why didn't he discharge that revolver to-day, and have enough sense to bring a thimbleful of powder to burn in this compartment after the work was done? One knows in an instant that the weapon used was an air-pistol, and that the fellow's only thought was how to do the thing without sound, not how to do it with sense. I don't suppose that there are three places in all London that stock air-pistols, and I don't suppose that they sell so many as two in a whole year's time. But if one has been sold or repaired at any of the shops in the past six months—well, Dollops will know that in less than no time. I 'phoned him to make inquiries. His task's an easy one, and I've no doubt he will bring back the word I want in short order. And now, Mr. Narkom, as our friend the assassin is such a blundering, short-sighted individual, it's just possible that, forgetting so many other important things, he may have neglected to search the body of his victim. Let us do it for him."
As he spoke he bent over the dead man and commenced to search the clothing. He slid his hand into the inner pocket of the creaseless morning coat and drew out a note-book and two or three letters. All were addressed in the handwriting of women, but only one seemed to possess any interest for Cleek. It was written on pink notepaper, enclosed in a pink envelope, and was postmarked "Croydon, December 9, 2.30 P.M.," and bore those outward marks which betokened its delivery, not in course of post, but by express messenger. One instant after Cleek had looked at it he knew he need seek no further for the information he desired. It read:
Piggy! Stupid boy! The ball of the dress fancy is not for to-morrow, but to-night. I have make sudden discoverment. Come quick, by the train that shall leave London Bridge at the time of twenty-eight minute after the hour of five. You shall not fail of this, or it shall make much difficulties for me, as I come to meet it on arrival. Do not bother of the costume; I will have one ready for you. I have one large joke of the somebody else that is coming, which will make you scream of the laughter. Burn this—Fifi.
And at the bottom of the sheet:
Do burn this. I have hurt the hand, and must use the writing of my maid; and I do not want you to treasure that.
"There's the explanation, Mr. Narkom," said Cleek as he held the letter out. "That's why he came by this particular train. There's the snare. That's how he was lured."
"By Fifi!" said Narkom. "By Jove! I rather fancied from the first that we should find that she or her husband had something to do with it."
"Did you?" said Cleek with a smile. "I didn't, then; and I don't even yet!"
Narkom opened his lips to make some comment upon this, but closed them suddenly and said nothing. For at that moment one of the constables put in an appearance with news that, "Two ladies and two gentlemen have arrived, sir, and are asking permission to view the body for purposes of identification. Here are the names, sir, on this slip of paper."
"Lady Stavornell; Colonel Murchison; Hon. Mrs. Brinkworth; Captain James Crawford," Narkom read aloud; then looked up inquiringly at Cleek.
"Yes," he said. "Let them come. And—Mr. Narkom?"
"Yes?"
"Do you happen to know where they come from?"
"Yes. I learned that when I sent word of Stavornell's death to them this evening. Lady Stavornell and her father have for the past week been stopping at Cleethorp Hydro, to which they went for the purpose of remaining over the Christmas holidays; and, oddly enough, both Mrs. Brinkworth and Captain Crawford turned up at the same place for the same purpose the day before yesterday. It can't be very pleasant for them, I should imagine, for I believe the two ladies are not very friendly."
"Naturally not," said Cleek, half abstractedly. "The one loathing the man, the other loving him. I want to see those two ladies; and I particularly want to see those two men. After that——" Here his voice dropped off. Then he stood looking up at the shattered globe, and rubbing his chin between his thumb and forefinger and wrinkling up his brows after the manner of a man who is trying to solve a problem in mental arithmetic. And Narkom, unwise in that direction for once, chose to interrupt his thoughts, for no greater reason than that he had thrice heard him mutter, "Suction—displacement—resistance."
"Working out a problem, old chap?" he ventured. "Can I help you? I used to be rather good at that sort of thing."
"Were you?" said Cleek, a trifle testily. "Then tell me something. Combating a suction power of about two pounds to the square inch, how much wind does it take to make a cutting-table fly, with an unknown weight upon it, from the Sydenham switch to the Low Level station? When you've worked that out, you've got the murderer. And when you do get him he won't be any man you ever saw or ever heard of in all the days of your life! But he will be light enough to hop like a bird, heavy enough
