sounded from a distant point of the city. The sound trembled the walls of the building, shook the floor beneath their feet. "The Phantom!" said Ga-Marr. "She struck!" Faggard's face was livid. "You fool!" he snarled. "Do you realize what you've done?" Standish betrayed no emotion. "Perfectly. I've divided your army in half. I've cut an aisle through your defense, through which my people even now are beginning to advance." Abruptly the Earthman's teeth clicked together. "Now what have you done with Thalia and the Emperor. Tell me or...." Faggard's shoulders slumped in defeat. He groped to his feet like a blind man and stumbled across the room. "I'll show you," he said huskily. He open a connecting door, and Standish saw two familiar figures in the adjoining room, an older man and a young girl. But in that instant Faggard acted. He lunged across the room, reached up to a shelf filled with chemical tubes and vials. Seizing a bottle of colorless liquid, he threw it straight at Standish. The bottle struck the door frame, and acid geysered in all directions. The Earthman felt a hot stab of agony lance across his left arm. But Ga-Marr was not taken off guard. His genithode pistol exploded even as Faggard reached for a second bottle. The Sirian threw up his arms, staggered and pitched forward on his face. Thalia was in Standish's arms then, sobbing. But in the outer corridor running steps sounded. A heavy fist banged on the door. "In here," the girl cried. "This door. It leads to a tunnel that passes under the city. It's Drum Faggard's secret avenue of retreat. He has the key in his pocket." As they sped to safety Standish felt a wave of elation sweep over him. He had won...! Three days later a small cruiser took off from Omaha, swept through the stratosphere and headed for the planet, Lyra, many light years distant. Four persons occupied her pilot cabin: Standish, Thalia, Ga-Marr and the emperor. "It's all over," the Earthman said to the girl. "The war is ended. Sirius' power is forever broken, and even now the work of reconstruction has begun. Earth and the whole solar system can return to peace." Ga-Marr nodded. "What now?" he asked.