“How long have you been here?” asked Alleyn.
“Since ten o’clock last night, sir. I’ll be relieved fairly soon — eight o’clock with any luck.”
“You can go off now. We’ll be here until then. Tell Superintendent Blackman I said it was all right.”
“Thank you very much, sir. I think I’ll go straight home. Unless— ”
“Yes?”
“Well, sir, if you’re going to work here, I’d like to look on — if it’s not a liberty, sir.”
“Stay, by all means. What’s your name?”
“Sligo, sir.”
“Right. Keep your counsel about our business. No need to tell you that. Come along.”
Alleyn led them to the studio window. He released the blind and opened the window. The ledge outside was rimy with frost.
“Last night,” said Alleyn, “we noticed certain marks on this window-sill. Look first of all at the top of the stool here. You see four marks — indentations in the surface?”
“Yes, sir.”
“We’re going to measure them.”
Alleyn produced a thin steel tape and measured the distance between the indentations. Fox wrote the figures in his note-book.
“Now the window-sill. You see these marks?” He pointed to two lateral marks, shiny and well defined, like shallow grooves. Alleyn measured the distance between them and found that it corresponded exactly with the previous figure. The width of the marks, the depth, and the appearance were the same as those on the stool.
“Garcia had his model on a small wheeled platform,” said Alleyn. “Now, Malmsley told us that Garcia proposed to wheel the model into the case and then put the whole thing on board whatever vehicle called to collect it. I think he changed his mind. I think he put the empty crate in the vehicle, drew the stool up to the sill, and wheeled the model over the sill into the crate, and aboard the caravan which was backed up to the window in the lane outside.”
“The caravan, sir?” asked Sligo. “Was it a caravan?”
“Lock this place up and come along outside. You can get over the sill, but don’t touch those two marks just yet. Jump well out to the side and away from the tyre-tracks.”
In the lane Alleyn showed them the traces left by the wheels. They had been frozen hard.
“Bailey has taken casts of these, but I want you to note them carefully. You see at once that the driver of the van or whatever it was did a good deal of skirmishing about. If there were any footprints within twelve feet of the window, they’ve been obliterated. Farther out are the traces of the mortuary van, blast it. The caravan tracks overlap, and there are four sets of them. But if you look carefully, you can pick out the last impression on top of all the others. That’s when the van was finally driven away. The next set, overlaid by these, represents the final effort to get in close to the window. Damn! it’s beginning to rain. This will be our last chance in the lane, so let’s make the most of it. Observe the tread, Sligo. There, you see, is the clear impression of a patch. I’ll measure the distance between the wheels and the width of the tyres. There a little oil has dripped on the road. The van or whatever it is has been recently greased. It was backed in and the brakes jammed on suddenly, but not quite suddenly enough. The outer edge of the window-sill has had a knock. The front wheels were turned after the vehicle had stopped. There are the marks. From them we get the approximate length of the wheel-base. Out in the middle of the lane they disappear under the tracks of more recent traffic. Now look at the branches of that elm. They reach across the lane almost to our side, and are very low. I wonder the county councillors have not lopped them down. Do you see that one or two twigs have been snapped off? There’s been no wind, and the breaks are quite recent. See here!”
He stooped and picked up a broken twig.
“It is still sappy. There are several. One quite close to the studio wall, and there’s another across the lane. If it should happen they were snapped off by the top of a vehicle, it must have moved from one side to the other. It is a fair chance, isn’t it, that they were broken by our van, and, if this is so, they give an idea of its height. Right?”
“That’s right, sir,” said Mr. Sligo, breathing loudly through his nostrils.
“You know all this sort of stuff, of course,” said Alleyn, “but it’s a characteristic example of outside work. Now come along to the garage.”
They walked along the lane through a wide entrance into the garage yard. Alleyn unlocked the garage doors and broke the police tape. It had begun to rain steadily.
“I took some measurements here last night, but it would be as well to verify them. Suppose you have a stab at it, Sligo.”
Sligo, intensely gratified, measured the width of the tyres and the wheel-base.
“The tyres are the same, sir. Look here, sir, here’s the patch on the rear tyre on the driving side. We found the trace on the left-hand as you faced the window, sir, so she was backed all right.”
“Good,” said Alleyn. “That’s the way, Sligo. Now take a look at the doorstep. Wait a moment. I’ll just have a go at the handle for prints.”
He opened his bag and got out his insufflator. The grey powder showed no prints on the door or doorknob. Alleyn closely examined the three steps, which were worn and dirty.
“Don’t touch these,” he said, and opened the door.
“Now then, Sligo— ”
“There they are, sir, there they are. Same marks on the top step. That’s the marks of them little wheels, sir, isn’t it?”
“I think so. Check them to make sure. Here are the measurements of the scars on the window-sill.”
Out came Sligo’s tape again.
“It’s them, for sure,” he said.
“Now have a look on the roof. If you climb on that bench, you’ll do no harm. Co carefully, though. You never know if you won’t spoil a perfectly good bit of evidence in the most unlikely spot.”
Sligo mounted the bench like a mammoth Agag, and peered over the roof of the caravan.
“Eh, there’s a-plenty of scratches, sir, right enough, and Gor’, Mr. Alleyn, there’s a bit of a twig jammed between the top roofing and the frame. Dug into the crack. Gor’, that’s a bit of all right, isn’t it, sir?”
“It is indeed. Can you reach it?”
“Yes, sir.”
“Take these tweezers and draw it out carefully. That’s right. Now you can come down. Let’s have an envelope, Fox, may we? We’ll put your twig in there, Sligo, and label it. How far is it from here to London?”
“Twenty miles exactly, sir, to the end of the drive from Shepherd’s Bush,” answered Sligo promptly.
“Right!”
Alleyn packed his case and began with Fox and Sligo to examine the yard and the gateway into the lane.
“Here are the tracks clear enough in the lane,” said Fox. “We’ve got enough here and more to show this caravan was driven into the lane, backed up to the studio window and loaded up through the window. Who does the caravan belong to?”
“Miss Troy, I think,” said Alleyn.
“Is that so?” responded Fox, without any particular emphasis.
“We’ll find out presently. Seal the garage up again, will you, Fox? Blast this weather. We’d better have a look at Pilgrim’s car.”
Basil Pilgrim’s car was a very smart supercharged two-seater. The upholstery smelt definitely of Valmai Seacliff, and one of the side-pockets contained an elaborate set of cosmetics. “For running repairs,” grunted Alleyn. They opened the dicky and found a man’s rather shabby raincoat. Pilgrim’s. “Also for running repairs, I should think.” Alleyn examined it carefully, and sniffed at it. “Very powerful scent that young woman uses. I fancy, Fox, that this is the pure young man’s garment for changing wheels and delving in engines. Now then, Sligo, you have a look at this. It’s ideal for demonstration purposes — the sort of thing Holmes and Thorndyke read like a book. Do you know Holmes and Thorndyke? You should. How about giving me a running commentary on an old raincoat?”