"You'll find that I mean to do so," Williamson replied.
Soon after he went out, Andrew and Whitney returned. Mackellar told them what Williamson had promised, and added:
"The man might have been dangerous, but we need not fear any further trouble from him. There are two points worth noting, though I cannot tell whether they concern us or not. He's anxious to avoid anything that might damage his credit and make him leave this part of the country; and he expects some money before long. Can ye account for this?"
They discussed the matter for a few minutes; and then Andrew and Whitney hurried back to the garage.
"Our man must be some distance ahead," Whitney said. "We may even lose him."
CHAPTER XVI
TRAILING THE MOTORCYCLE
For a few minutes Whitney's machine turned in and out of narrow streets between rows of tall, old houses, and then went cautiously down the dip to the Nith. There was some traffic on the bridge, and when they had crossed, carts encumbered the road on the Galloway side. Whitney fumed at the delay; but he opened out his engine as they entered a stretch of open road, and the wind began to fan Andrew's face.
For a mile in front of them the river-plain ran level, the stubble shining yellow among squares of pasture and the dark green of turnip-fields; then a ridge of hills rose steeply across their way. The sun that flooded the valley with mellow light was getting low, and while the trees upon the summit of the ridge stood out sharply distinct, the wooded slopes were steeped in soft blue shadow.
"Looks like a climb," Whitney remarked. "I suppose we go right up there?"
"Maxwellton braes," said Andrew. "I expect you have heard of then. It's an easy gradient up a long glen."
"Then sit tight, and we'll rush her up on the top gear."
The dust whirled behind them, and the cropped hedgerows spun past; they swung giddily round a curve at a bridge, and the throb of the engine grew louder as they breasted the hill. Dark firs streamed down to meet them; here and there a leafless birch and an oak that gleamed like burnished copper swept by. There was a tinkle of running water in the wood; and, now that they were out of the sunshine, the air felt keen. Ahead, the ascending road unrolled like a white riband through faint, shifting lights and lilac shadow.
Soon the glen ran out into a wide hollow that led westward across a tableland. Low, green hills with gently rounded tops shut off the rugged moors beyond; the shallow vale was cultivated and tame, but the road was good, and Andrew felt the thrill of speed. Long fields and stone dykes swept behind into the trail of dust. The sun sank toward a bank of slate-colored cloud; its rays raked the valley, throwing the black shadows of the scattered ash-trees far across the fields.
Andrew kept his eyes fixed steadily upon the road. This ran, for the most part, straight and level; but, though they were traveling very fast, there was no speeding streak of dust ahead.
After a time a long white village rose from the rolling pasture; and when they ran in among the low houses Whitney pulled up. There was a smith's shop by the roadside, and a man stood outside, holding a cartwheel, while another moved a glowing iron hoop amid the flame of a circular fire.
"You have been watching that tire heat for a while, I guess," said Whitney.
"Lang enough," the other answered. "She's no' stretching weel."
"Then have you seen a small, black motorcycle pass?"
"No; there was a big gray yin, an' anither with a side-car."
"How long have you been outside?"
"Maybe twenty minutes; maybe a few mair."
"Thanks," said Whitney; and started the motorcycle.
"It's curious. He's traveling light, but I don't think a single-cylinder engine could beat the machine I'm driving by a quarter of an hour. Anyhow, I'll try to speed her up."
The sunlight faded off the grass as they raced away; the slaty clouds rolled higher up the sky; and the wind that whipped their faces bit keen. Andrew was swung to and fro in the rocking car, and sometimes felt uneasy when his comrade dashed furiously round the bends; but for most of the way the road ran straight, and they could see nothing on the long, white streak ahead. After a time they came to a narrow loch, ruffled by the wind, that lay in a lonely, grassy waste, and as they ran past the thin wood on its edge Andrew asked Whitney to stop.
"A motor scout," he said, indicating a man in uniform who rode leisurely toward them on a bicycle.
The scout dismounted when they called to him, and said he had left Castle Douglas an hour before and had kept to the main road, but had not seen a single-cylinder motorcycle. They let him go and Whitney lighted a cigarette.
"Now," he said, "we have to think. Our man pulled out for Castle Douglas, but hasn't gone there; my notion is that he didn't mean to. Where's he likely to have headed?"
"It's hard to tell. A road runs northwest to New Galloway, but I can't see what would take him there. It's a small place on the edge of the moors."
"And right away from the Eskdale road!" Whitney ejaculated, looking hard at him.
"Well," said Andrew quietly, "I'll admit I thought of that."
"As a matter of fact, you've been thinking of something like it for quite a time."
Andrew was silent for a moment or two.
"There was a chance of my being mistaken," he said slowly. "However, I now feel that it's my duty to get upon the fellow's track, if I can."
"Would you rather I dropped out?"
Andrew knew that the suggestion was prompted by delicacy, but he made a negative sign.
"After all, you know something, and may as well know the rest – if there is anything more to learn. Besides, you're quicker than I am in several ways, and I might want you."
"When you do, you'll find me ready," Whitney answered. "But we'll get back to business. Which way do you suppose he's gone?"
"On the whole, I think south toward Dalbeattie; it's nearer the Solway. As it might be better to follow the road he'd take, we'll have to run back nearly to Dumfries."
"That's all right," said Whitney. "Get in. She seems to be feeling particularly good to-day, and I'm going to let her hum."
They raced back eastward while the distant hills turned gray in front of them. Then they turned sharply to the south, and soon the road skirted a railway line. Whitney got down when they reached a station.
"Have you seen a small, black motorcycle?" he asked a lounging porter.
"Yes; I mind her because I thought she was running verra hard for a wee machine. If yon man's a friend o' yours, ye'll no' catch him easy."
"When did he pass?"
"It would be about five minutes after the Stranraer goods cam' through, and that's an hour ago."
Whitney ran back to his machine and jumped into the saddle.
"We're on his trail, but he must have come straight and fast from Dumfries. Well, we'll get after him."
The car leaped forward as the clutch took hold; dykes and trees swept down the road; and Criffell's bold ridge rose higher against the eastern sky. Here and there a loch gleamed palely in the desolate tableland, and in the distance a river caught the fading light, but the cloud-bank was spreading fast and the west getting dim. At last they saw from the top of a rise a gray haze stretched across a hollow, and Andrew told his comrade that it was the smoke of Dalbeattie. Then a man with a spade and barrow came into view on the slope of another hill, and Andrew asked Whitney to stop. The man was cutting back the grass edges on the roadside; he had not seen a bicycle of the kind they described.
"How long have you been here?" Andrew asked.
"Since seven o'clock this morning."