that it had never been taken for a ship. I don't know how you lived—but the Dondara Stone had promised that you would." An eager enthusiasm was ringing in his voice. "I salute you, Barihorn!" I was swaying with weakness and fatigue. Thirst and desperate hunger tortured me, and the agonizing stiffness of my body. But these riddles were more urgent still. The Dondara Stone—was that the crystal brain of Dondara Keradin? I stared at the young giant in silver, and once more my dry throat found husky speech. "Tell me—" I gasped. "There are so many things that I must know! But first tell me who you are, and how you know of the Dondara Stone, and if there is still"—some instinctive dread brought my voice to a whisper—"still a robot named Malgarth?" A cold bright light flashed in the eyes of the stranger. "My name," he said, "is Kel Aran. But to the Emperor's Galactic Guard, and to the Space Police of Malgarth's Corporation, I am just the Falcon. Or sometimes the Falcon of Earth—for I was born on your own planet, Barihorn!" I was reeling on my feet. He reached out a strong argent arm to steady me. "The Stone?" I whispered. "The Stone is on the Earth." A reverence was in his voice, as if he had spoken of a living god—or goddess. "I saw it once when I was a child on Earth. For my father was a Warder of the Stone. And now—" I wondered at the softness in his voice, the shadow of agony on his cragged face. "Now," he said, "Verel Erin is the Stone's Custodian. She is a red-haired girl of Earth. I loved her when we were children in the desert valley where the Stone is hidden. I loved her—but the Warders chose her to be the Custodian." His lean face was white, and his tone had the break of tragedy. Darkness was crowding upon me. But I found the strength for one more question. "Malgarth—" The silver shoulders of Kel Aran drew square, and his gray eyes shone with a fighting glint. "Malgarth still rules the Corporation," he said. "And the Corporation has grown mightier than the Empire. Your prophesied return is in good time, Barihorn, for the struggle is at hand! It will be the robots, or mankind—both cannot survive." "War?" My dry lips