Zircon went through the opening an inch at a time, on hands and knees. The others followed, to find themselves in a cave almost identical to the one they had left, except for the stone waterfall. This cave, too, had walls broken in a number of places. Rick and Zircon flashed their lights around, seeking the next step. Then Rick caught a quick glimpse of something red that moved! Quick as a flash he shifted his hand on the stock of his rifle, pointed it like a pistol, and fired. The red object vanished! The thunderous echo of the shot reverberating through the cave drowned out his yell. He sprang through the entrance where he had seen the flash of red and found himself in still another cave. Scotty was right behind him. "What is it?" Scotty demanded. "I think it was a man," Rick said quickly. "He was wearing something red. Come on, he can't be very far from here." "Which way?" There was no way of telling which way the man had gone. There were a half dozen openings in the cave walls. Rick pointed at the two biggest. "You take that one and I'll take this." Rifle ready and flashlight held in front of him, he ran through the break in the wall he had indicated. Scotty hurried to the other. If only they could get their hands on even one man, Rick thought, they might force him to serve as their guide! He passed through another cave, choosing the biggest entrance on the opposite wall. As he went through it, he was certain he saw a movement, as though the quarry had just rounded a corner. He let out a yell and lengthened his stride. In a second he reached the corner, rounded it, and found himself in an odd cave with countless pillars, formed when stalactites from the ceiling and stalagmites from the floor had joined together. It was a veritable labyrinth. He started through it, got perhaps fifty feet, and stopped. The man he had chased surely knew his way around the caves. There was no hope of overtaking him now. Better rejoin the others, Rick thought. It was senseless to get too far away from his companions. He turned and started back, then hesitated, not sure of the way he had come. The corridors formed by the limestone pillars led in all directions. "I must have come this way," he muttered, and started off. Then he stopped again, playing his light around. He couldn't be sure. Suddenly worried, he ran forward and was brought to a halt by a solid wall. He turned and hurried along it, seeking an opening. He found one, but smaller than the one through which he had come. He plunged on, found a big opening, and went through it into an irregular cave unlike any he had seen before. He turned to retrace his steps, and his eyes met a wall where the openings were separated only by glistening partitions of limestone. He couldn't even be sure of the one through which he had just entered. He licked lips that were suddenly dry. "I can't lose my head," he told himself sternly. "I've got to stay calm."