"Then perhaps," the latter lady suggested, "you will inform us if you have discovered anything."
"I will tell you." replied Thorndyke, "all that we know. The child was abducted by the man who occupied this house, and who appears to have watched him from an upper window, probably through a glass. This man lured the child into the wood by blowing this bird-call; he met him in the wood, and induced him—by some promises, no doubt—to come with him. He picked the child up and carried him—on his back, I think—up to the house, and brought him in through the front door, which he locked after him. He gave the boy this clock and the bird-call to amuse him while he went upstairs and packed his trunk. He took the trunk out through the back door and down the garden to the shed there, in which he had a motor-car. He got the car out and came back for the boy, whom he carried down to the car, locking the back door after him. Then he drove away."
"You know he has gone," cried Mrs. Haldean, "and yet you stay here playing with these ridiculous toys. Why are you not following him?"
"We have just finished ascertaining the facts," Thorndyke replied calmly, "and should by now be on the road if you had not come."
Here the inspector interposed anxiously. "Of course, sir, you can't give any description of the man. You have no clue to his identity, I suppose?"
"We have only his footprints," Thorndyke answered, "and this fluff which I raked out of the barrel of his latchkey, and have just been examining. From these data I conclude that he is a rather short and thin man, and somewhat lame. He walks with the aid of a thick stick, which has a knob, not a crook, at the top, and which he carries in his left hand. I think that his left leg has been amputated above the knee, and that he wears an artificial limb. He is elderly, he shaves his beard, has white hair dyed a greyish black, is partly bald, and probably combs a wisp of hair over the bald place; he takes snuff, and carries a leaden comb in his pocket."
As Thorndyke's description proceeded, the inspector's mouth gradually opened wider and wider, until he appeared the very type and symbol of astonishment. But its effect on Mrs. Haldean was much more remarkable. Rising from her chair, she leaned on the table and stared at Thorndyke with an expression of awe—even of terror; and as he finished she sank back into her chair, with her hands clasped, and turned to Mrs. Hanshaw.
"Jane!" she gasped, "it is Percy—my brother-in-law! He has described him exactly, even to his stick and his pocket-comb. But I thought he was in Chicago."
"If that is so," said Thorndyke, hastily repacking his case, "we had better start at once."
"We have the dogcart in the road," said Mrs. Hanshaw.
"Thank you," replied Thorndyke. "We will ride on our bicycles, and the inspector can borrow Willett's. We go out at the back by the cart-track, which joins the road farther on."
"Then we will follow in the dogcart," said Mrs. Haldean. "Come, Jane."
The two ladies departed down the path, while we made ready our bicycles and lit our lamps.
"With your permission, inspector," said Thorndyke, "we will take the key with us."
"It's hardly legal, sir," objected the officer. "We have no authority."
"It is quite illegal," answered Thorndyke; "but it is necessary; and necessity—like your military J.P.—knows no law."
The inspector grinned and went out, regarding me with a quivering eyelid as Thorndyke locked the door with his skeleton key. As we turned into the road, I saw the light of the dogcart behind us, and we pushed forward at a swift pace, picking up the trail easily on the soft, moist road.
"What beats me," said the inspector confidentially, as we rode along, "is how he knew the man was bald. Was it the footprints or the latchkey? And that comb, too, that was a regular knock-out."
These points were, by now, pretty clear to me. I had seen the hairs with their atrophied bulbs—such as one finds at the margin of a bald patch; and the comb was used, evidently, for the double purpose of keeping the bald patch covered and blackening the sulphur-charged hair. But the knobbed stick and the artificial limb puzzled me so completely that I presently overtook Thorndyke to demand an explanation.
"The stick," said he, "is perfectly simple. The ferrule of a knobbed stick wears evenly all round; that of a crooked stick wears on one side—the side opposite the crook. The impressions showed that the ferrule of this one was evenly convex; therefore it had no crook. The other matter is more complicated. To begin with, an artificial foot makes a very characteristic impression, owing to its purely passive elasticity, as I will show you to-morrow. But an artificial leg fitted below the knee is quite secure, whereas one fitted above the knee—that is, with an artificial knee-joint worked by a spring—is much less reliable. Now, this man had an artificial foot, and he evidently distrusted his knee-joint, as is shown by his steadying it with his stick on the same side. If he had merely had a weak leg, he would have used the stick with his right hand—with the natural swing of the arm, in fact—unless he had been very lame, which he evidently was not. Still, it was only a question of probability, though the probability was very great. Of course, you understand that those particles of woody fibre and starch granules were disintegrated snuff-grains."
This explanation, like the others, was quite simple when one had heard it, though it gave me material for much thought as we pedalled on along the dark road, with Thorndyke's light flickering in front, and the dogcart pattering in our wake. But there was ample time for reflection; for our pace rather precluded conversation, and we rode on, mile after mile, until my legs ached with fatigue. On and on we went through village after village, now losing the trail in some frequented street, but picking it up again unfailingly as we emerged on to the country road, until at last, in the paved High Street of the little town of Horsefield, we lost it for good. We rode on through the town out on to the country road; but although there were several tracks of motors, Thorndyke shook his head at them all. "I have been studying those tyres until I know them by heart," he said. "No; either he is in the town, or he has left it by a side road."
There was nothing for it but to put up the horse and the machines at the hotel, while we walked round to reconnoitre; and this we did, tramping up one street and down another, with eyes bent on the ground, fruitlessly searching for a trace of the missing car.
Suddenly, at the door of a blacksmith's shop, Thorndyke halted. The shop had been kept open late for the shoeing of a carriage horse, which was just being led away, and the smith had come to the door for a breath of air. Thorndyke accosted him genially.
"Good-evening. You are just the man I wanted to see. I have mislaid the address of a friend of mine, who, I think, called on you this afternoon—a lame gentleman who walks with a stick. I expect he wanted you to pick a lock or make him a key."
"Oh, I remember him!" said the man. "Yes, he had lost his latchkey, and wanted the lock picked before he could get into his house. Had to leave his motor-car outside while he came here. But I took some keys round with me, and fitted one to his latch."
He then directed us to a house at the end of a street close by, and, having thanked him, we went off in high spirits.
"How did you know he had been there?" I asked.
"I didn't; but there was the mark of a stick and part of a left foot on the soft earth inside the doorway, and the thing was inherently probable, so I risked a false shot."
The house stood alone at the far end of a straggling street, and was enclosed by a high wall, in which, on the side facing the street, was a door and a wide carriage-gate. Advancing to the former, Thorndyke took from his pocket the purloined key, and tried it in the lock. It fitted perfectly, and when he had turned it and pushed open the door, we entered a small courtyard. Crossing this, we came to the front door of the house, the latch of which fortunately fitted the same key; and this having been opened by Thorndyke, we trooped into the hall. Immediately we heard the sound of an opening door above, and a reedy, nasal voice sang out:
"Hello, there! Who's that below?"
The voice was