Then something in the sound, which was rapidly growing louder, struck him as curious, and he listened more closely with a frown, for it was now becoming evident that instead of one pursuer he had two to deal with, which was certainly not what he had desired or expected. Touching Volador with his heels, he let him go, and for five or six minutes they fled south at a fast gallop with a thud of hoofs on sun-baked sod ringing far behind them. Then he pulled the horse up with a struggle, and listened again. He was at length certain that the police had heard him and were following as fast as possible. There was no cover until he reached the mountain; nothing but an open wilderness, unbroken by even a ravine or a clump of willows, and he must ride.

Once more he let Volador go, and the cool night air streamed past him, whipping his hot face and bringing the blood to it, while long billowy rises came back to him, looking in the uncertain moonlight like the vast undulations of a glassy sea underrun by the swell of a distant gale. Each time he swung over the gradual crest of one, a rhythmic staccato drumming became sharply audible, and sank again as he dipped into the great grassy hollows. Volador seemed fresh still, which was consoling, for there was no doubt that the sound of the pursuit was as clear as it had been. This was a fresh surprise.

Half an hour passed, and they swung out upon a wide, high level, where for the first time he twisted in his saddle and looked behind him. He could see, rather more plainly than he cared about, two dim figures, spread out well apart on the verge of the plateau, and it was evident that they were not dropping behind. It would, he recognized, lead to unpleasant complications if they overtook him. He raised a quirt he had borrowed, but, reflecting, he let his arm drop again. After all, it might be desirable to let Volador keep a little in hand. Then he glanced to the westward, and was pleased to see that the moon was rapidly nearing the rim of the plain. It would be dark when he reached the mountain.

Volador was flagging a little when at length they swept up the slope of another rise. On crossing the top of this Thorne was conscious of a difference in the drumming of hoofs behind. One of the pursuers was clearly falling back, which was satisfactory, though he fancied that the other man was still holding his own. Then he saw away in front of him a blurred mass with an uneven crest which cut dimly black against the sky. It stretched broad across his course, and he struck Volador with the quirt, for he recognized it as the mountain, and knew that he must ride in earnest now. A mounted man would make a good deal of noise descending the ravines which seamed it and smashing through the undergrowth beneath the birches, and it was desirable that he should reach their shelter well ahead of the troopers.

The horse responded gallantly, but the beat of hoofs which he longed to get away from grew no fainter, and when five minutes had flown by he plied the quirt again. He was very hot, and somewhat anxious, but the moon was now near the verge of the prairie. It was large and red, and already the light was failing, though a long black shadow still fled beside him across the dewy grass.

At last he fancied he was drawing ahead, and a mad fit came upon him as they went flying down a rugged and broken slope to a water-course, while the mountain rose higher and blacker ahead. Stones clattered and rattled under them, clouds of light soil flew up, and then there was a great splashing as the horse plunged through the creek. After that the pace grew slower as they faced the ascent; and he swung low in the saddle when they sped in among the birches. A branch struck him in the face and swept his hat away, but it had done its work and he decided that he was better rid of it.

A semblance of a trail that dipped into hollows and swung over rises led through the mountain, though as a rule any one riding south skirted this. Thorne had already decided that he must leave it somewhere as quietly as possible and let Corporal Slaney go by. He could not hear the trooper now, and this was reassuring, for he would have to stop soon and he did not wish his pursuer to notice that the noise in front of him had suddenly ceased.

Two or three minutes later, however, the sound he was beginning to dread once more reached him, breaking in upon the crackle of dry sticks under his horse's hoofs and the crash he made as he now and then blundered into a brake or thicket. It was very dark in the bluff; he could scarcely see the spectral trunks of the flitting trees, and to pick the way or avoid the obstacles around which the trail here and there twisted was out of the question. He faced the hazards as they came and rode savagely; but the thud of pursuing hoofs and the smashing and crackling which mingled with it sounded very close when he reached the brink of a ravine which he understood it was almost impossible to descend on horseback. To dismount would, however, as he realized, entail his capture; and setting his lips tight he drove the failing horse at the almost precipitous gully. They plunged down with soil and stones sliding and rattling after them, splashed into a creek, and were half-way up the opposite side when a second clatter of falling stones was followed by a heavy downward rush of loosened soil. Then there was a dull thud and afterward a curiously impressive silence.

Thorne pulled up his badly blown horse and, twisting in his saddle, looked back across the ravine. He could see nothing but a shadowy mass of trees which stood out dimly against a strip of soft blue sky. He could feel his heart beating, and the deep silence troubled him. Indeed, it was with difficulty that he refrained from shouting to the fallen man, but he reflected that as he had now and then spoken to Slaney, the latter would probably recognize his voice. Then he heard the man get up, and the sounds which followed indicated that he was urging his horse to rise. Thorne once more tapped Volador with his quirt.

A hoarse cry rang after him, commanding him to stop, but this was on the whole a consolation, for it did not seem likely that Slaney was badly hurt if he could shout, and Thorne rode on with a laugh. He scarcely supposed the policeman's horse would be fit for much after a heavy fall, but there was another trooper somewhere behind who might turn up at any moment. He purposely rode through a brake or two in order that the crackle of undergrowth might make it clear that he was going on, and then, when some time had passed and there was no sign of any pursuit, he turned sharply off the trail and headed into the bush. It soon became necessary to dismount and lead his horse, and finally he looped the bridle round a branch and sat down wearily.