The more Dave thought about Ed Austin's death, the more certain he became that it was in some way connected with Alaire's disappearance; and the loose end by which the tangle might be unraveled, it seemed to him, lay in the hands of Rosa Morales, Jose's sweetheart. That Sanchez was the murderer Dave now had little doubt; but since the chance of apprehending him was small, he turned his attention to the girl. He would make Rosa speak, he told himself, if he had to use force--this was no time for gentle methods. If she knew aught of Alaire's whereabouts or the mystery of her departure from Las Palmas, he would find a way to wring the truth from her. Dave's face, a trifle too somber at all times, took on a grimmer aspect now; he felt a slow fury kindling in his breast. Years of experience had taught him to be always alert even during his moments of deepest preoccupation, and so, from force of habit, when he came to the pump-house road he carefully scanned it. In the dust were fresh hoof-prints leading toward the river. Now he knew this road to be seldom used, and therefore he wondered who could be riding it at a gallop in this blistering midday heat. A few rods farther on and his quick eye detected something else--something that brought him from his saddle. Out of the rut he picked a cigarette butt, the fire of which was cold but the paper of which was still wet from the smoker's lips. He examined it carefully; then he remounted and rode on, pondering its significance. Dave loped out of the thicket and straight across the clearing to the Morales house. Leaving Montrosa's reins hanging, he opened the door and entered without knocking. Rosa appeared in the opening to another room, her eyes wide with fright at this apparition, and Dave saw that she was dressed in her finest, as if for a holiday or for a journey. "Where's your father?" he demanded. "He's gone to Sangre de Cristo. What do you want?" "When did he go?" "This morning, early. He--" "Who's been here since he left?" Rosa was recovering from her first surprise, and now her black brows drew together in anger. "No one has come. You are the first. And have you no manners to stride into a respectable house--?" Dave broke in harshly: "Rosa, you're lying. Jose Sanchez has been here within an hour. Where is he?" When the girl only grew whiter and raised a hand to her breast, he stepped toward her, crying, "Answer me!" Rosa recoiled, and the breath caught in her throat like a sob. "I'll tell you nothing," she said in a thin voice. Then she began to tremble. "Why do you want Jose?" "You know why. He killed Don Eduardo, and then he rode here. Come! I know everything." "Lies! Lies!" Rosa's voice grew shrill. "Out of this house! I know you. It was you who betrayed Panfilo, and his blood is on your hands, assassin!" With the last word she made as if to retreat, but Dave was too quick; he seized her, and for an instant they struggled breathlessly.