Seen from the air, Lion Mesa, in the southwest section of the American continent on the Freehold Planet of Terra, was a tilted, roughly triangular table-land, furred green with thick clusters of cedar and pinyon, scarred by outcroppings of naked rock. It was eight miles across at its widest and highest point, directly behind an upthrust mass of stone jutting toward the north and somewhat suggestive of the short lifted neck and heavy skull of a listening beast. Presumably it was this unusual formation which gave the mesa its name. From there the ground dropped to the south, narrowing gradually to the third point of the triangle. Near the southern tip in cleared ground were the only evidences of human habitation--half a dozen buildings of small to moderate size, handsomely patterned in wood and native stone. Directly adjoining one of the buildings was a large, massively fenced double corral. This was an experimental animal ranch; it and the mesa plus half a hundred square miles of surrounding wasteland and mountain were the private property of one Miguel Trelawney, Terrestrial Freeholder. For the past twenty minutes, Frank Dowland--Lieutenant Frank Dowland, of the Solar Police Authority--had kept his grid-car moving slowly along the edges of a cloud bank west of the mesa, at an unobtrusive height above it. During that time, he was inspecting the ranch area in the beam of a high-powered hunting-scope. He had detected no activity, and the ranch had the general appearance of being temporarily deserted, which might be the case. Miguel Trelawney's present whereabouts were not known, and Lion Mesa was only one of the large number of places in which he was periodically to be found. Dowland put the scope down finally, glanced at the sun which was within an hour of setting. He was a stocky man in his early thirties, strongly built, dressed in hunting clothes. The packed equipment in the grid-car, except for a few special items, was that of a collector of live game, the role regularly assumed by Dowland when at work on the planet. The Freeholder Families traditionally resented any indication of Overgovernment authority on Terra, and would have been singularly uncordial to a Solar City police detective here, regardless of the nature of his mission. But the export of surplus native fauna was one of the forms of trade toward which they were tolerant. Moreover, they were hunting buffs themselves. Dowland ordinarily got along well enough with them. He now opened a concealed compartment in the car's instrument panel, and brought out a set of pictures of Trelawney's ranch on the mesa, taken from an apparent distance of a few hundred yards above it. For some seconds, Dowland compared the depth photographs with the scene he had been observing. There appeared to have been no changes in any of the structures in the eight months since the pictures were taken. At least not above ground.