The gaze of the man on the ridge was concentrated on the bit of road which showed on the hogback and the slope beyond. A truck was laboriously climbing the ascent. But the watcher evidently was not so much concerned with the approach of the truck as with certain movements which were in progress on the hogback at the head of the grade. Three persons had dismounted from their horses behind the screen of timber. One, a tall man, had donned a long, black slicker and was tying a handkerchief about his face. "Juniper, hoss," said Rathburn, "what does that gent want that slicker on for? It ain't going to rain. An' how does he reckon to see onless maybe he's got holes cut in that there hanky?" A second man had made his way down the slope a short distance. He took advantage of the timber which screened him from sight of the driver of the oncoming truck. "I 'spect that's in case the truck driver should suddenly take it into his head to slide down backwards," said the observer, speaking his thoughts aloud in a musical, bass voice. "One in front, one behind; now how about the kid?" As if in answer to his question the third member of the party, evidently a boy, led the horses a short way up the hogback where a good view could be obtained of the road in both directions. The watcher grunted in approval. "One in front to do the stick-up, one behind to stop a retreat and get whatever it is they're after, and one on the lookout to see there ain't any unexpected guests. Couldn't have planned the lay any better ourselves, hoss." He was too far distant to interfere, even if he had had any desire to do so, which was doubtful from his interested and tolerant manner. Anyway it could have done no good to shout a warning, for the driver of the truck could not have heard anything above the roar of his machine, and the trio had gone about the preparations with dispatch. Already the truck was climbing the last steep pitch to the top of the hogback. The tall man in the black slicker and mask now quickly stepped forth from the edge of the timber. The watcher above saw his right hand and arm whip out level with his shoulders. There was a glint of morning sunlight and dull metal. The truck came to a jarring stop as the driver jammed on the brakes. Then the driver's hands went into the air. Stepping from the timber at the roadside behind the truck, the second man leaped upon the machine. The watcher grunted again as he saw that this man was also masked. The driver was disarmed and searched, then forced to clamber down from the truck into the road, where the man in the slicker kept him covered while the other quickly searched about the seat and cab of the truck. Then the second man released the brakes and dropped nimbly from the machine which plunged backward down the steep slope, crashed into the tree growth on one side of the road, and overturned.