Polaris heard a shrill scream to his right, and turned swiftly on his heel, automatically swinging up his revolver to meet a new peril. Another being stood on the brow of the ridge--stood with clasped hands and horror-stricken eyes. Clad almost the same as the others, there was yet a subtle difference which garments could not disguise. Polaris leaned forward with his whole soul in his eyes. His hand fell to his side. He had made his second discovery. He had discovered woman! CHAPTER III POLARIS MAKES A PROMISE Both stood transfixed for a long moment--the man with the wonder that followed his anger, the woman with horror. Polaris drew a deep breath and stepped a hesitating pace forward. The woman threw out her hands in a gesture of loathing. "Murderer!" she said in a low, deep voice, choked with grief. "Oh, my brother; my poor brother!" She threw herself on the snow, sobbing terribly. Rooted to the spot by her repelling gesture, Polaris watched her. So one of the men had been her brother. Which one? His naturally clear mind began to reassert itself. "Lady," he called softly. He did not attempt to go nearer to her. She raised her face from her arms, crept to her knees, and stared at him stonily. "Well, murderer, finish your work," she said. "I am ready. Ah, what had he--what had they done that you should take their lives?" "Listen to me, lady," said Polaris quietly. "You saw me--kill. Was that man your brother?" The girl did not answer, but continued to gaze at him with horror-stricken eyes. Her mouth quivered pitifully. "If that man was your brother, then I killed him, and with reason," pursued Polaris calmly. "If he was not, then of your brother's death, at least, I am guiltless. I did but punish his slayer." "His _slayer_! What are you saying?" gasped the girl. Polaris snapped open the breech of his revolver and emptied its cartridges into his hand. He took the other revolver from its holster and emptied it also. He laid the cartridge in his hand and extended it. "See," he said, "there are twelve cartridges, but only one empty shell. Only two shots were fired--one by the man whom I killed, the other by me." He saw that he had her attention, and repeated his question: "Was that man your brother?" "No," she answered. "Then, you see, I could not have _shot_ your brother," said Polaris. His face grew stern with the memory of the scene he had witnessed. "They quarreled, your brother and the other man. I came behind the drift yonder and saw them. I might have stopped them--but, lady, they were the first men I had ever seen, save only one. I was bound by surprise. The other man was the stronger. He struck your brother into the crevasse. He would have shot me, but my mind returned to me, and with anger at that which I saw, and I killed him. "In proof, lady, see--the snow between me and the spot yonder where they stood is untracked. I have been no nearer."