At last after a long, hot ride they reached the bluffs marking the side of the plateau and soon were winding down a steep-walled arroyo which led to the plain below, and the country began to change with such insensible gradations that they hardly noticed it. Sage and greasewood became more plentiful and after an hour had passed an occasional low bush was to be seen and the ground sloped more and more in front of them. A low fringe of greenery lay along the distant bottom, where Sand Creek or some other hidden stream came close to the top of the soil, later to issue forth and become the stream into which the Question-Mark's creek later emptied. They crossed this and breasted an opposing slope, followed around the base of a low ridge of hills and at last stopped under a clump of live-oak and cotton woods in the extreme east end of the Question-Mark valley. While the two friends were riding toward the little clump of trees west of the Question-Mark ranch visitors rode slowly up to the door of the ranchhouse and one of them dismounted. The shield he wore on his open vest shone in the sun with nickel brightness, but his face was anything but bright. The job which had been cut out for him was not to his liking and had destroyed his peace of mind, and the peace of mind of the two deputies, who needed no reflection upon their subordinate positions to keep them in the sheriff's rear. What little assurance they might have started with received a jolt soon after they had left town, when a gruff and unmistakably unfriendly voice had asked, with inconsiderate harshness and profanity, their intended destination and their business. At last allowed to pass on after quite some humiliation from the hidden sentries, they now were entering upon the dangerous part of their mission. Corwin stepped up to the door and knocked, a formality which he never dispensed with on the Question-Mark. Other visitors usually walked right in and found a chair or sat on the table, but it never should be said to Corwin's discredit that an officer of the law was rude and ignorant in such a well-known and long-established form of etiquette. So Sheriff Corwin knocked. "Come in!" impatiently bawled a loud and rude voice. The sheriff obeyed and looked around the door casing. "Ah, hello, Mac," he said in cheery greeting. "Mac _who_?" roared the man at the table. "McCullough," said the man at the door, correcting himself. "How are you?" "Yo're one full-blooded d--n fool of a sheriff," sneered the trail-boss. "Where's them two prisoners I been waitin' for?" "They got away. Somebody helped 'em bust th' jail. I sent word back to you by yore own men."