He stood fast, feeling above their tension the swift progress of Janice Wynn through the darkness toward them. She was close to the nearer machine when he felt a sudden veering of her attention, followed the direction of her probing, and sensed another 'copter angling down out of the night. Her mental order was as urgent as a shout: Let no one in. No one! She moved on. The pilot of the third 'copter was only beginning to assume identity to Alcorn's sharpened senses when Janice Wynn drew within effective reach of the nearer grounded machine. The amplified voice was calling again: "Come out, Alcorn, or we'll have to—" It broke off short in a scream. There was a flurry of shots, a white flash in the darkness and a concussion that shook the cabin. He felt Janice turn and run purposefully through the darkness toward the second 'copter. The third machine was dropping in for landing when he identified its pilot. "Kitty!" he breathed. "Dear God, Kitty!" She was at the door, the terror and tenderness of her crying overwhelming his flinching perception. "Philip, let me in! Philip darling, are you all right?" She was inside and in his arms before he could prevent it. She clung to him frantically until the effect of his presence calmed her. The terror went out of her eyes slowly, but the tears glistening on her cheeks contradicted her smile of relief. "Thank God you're safe, Philip! When I heard on the visinews about Dr. Hagen—" Janice Wynn's silent command was violent in Alcorn's head. Put her out quickly! Do you want her there when your own change comes? He caught Kitty's hands and drew her toward the door. "You can't stay here, Kitty. There's no time to explain. I'll call later and tell you everything." She showed her hurt beneath the placidity his gift imposed upon her. "If I must, Philip. But—" He threw open the door. "Don't argue, Kitty. For God's sake, go!"