His voice was low, almost inaudible in the thundering roar of the bombardment. "Ann, I've got to go ahead. I've got to go tonight. To Nevada, to the Dartmouth plant there. I know I'm right, but I have to go, to check something--to make sure of something." He paused, looking down at her. "I'll be back, Ann. But I'm afraid of what I'll find out there. I need you behind me. Especially with what I have to do, I need you. You've got to decide. Are you for me? Or against me?" She shook her head sadly, and sank into a chair, gently removing his hands from her waist. "I loved my father, Tom," she said in a beaten voice. "I can't help what he's done--I loved him. I--I can't be with you, Tom." * * * * * Far below him he could see the cars jamming the roads leaving Washington. He could almost hear the noise, the screeching of brakes, the fistfights, the shouts, the blatting of horns. He moved south over open country, hoping to avoid the places where the 'copter might be spotted and stopped for questioning. He knew that Hart would have an alarm out for him by now, and he didn't dare risk being stopped until he reached his destination, the place where the last piece to the puzzle could be found, the answer to the question that was burning through his mind. Shells were made of steel and chemicals. The tools that made them were also made of steel. Not manganese. Not copper. Not electron relays, nor plastic, nor liquid oxygen. Just steel. The 'copter relayed south and then turned west over Kentucky. Shandor checked the auxiliary tanks which he had filled at the Library landing field that morning; then he turned the ship to robot controls and sank back in the seat to rest. His whole body clamored for sleep, but he knew he dare not sleep. Any slip, any contact with Army aircraft or Security patrol could throw everything into the fire-- For hours he sat, gazing hypnotically at the black expanse of land below, flying high over the pitch-black countryside. Not a light showed, not a sign of life. Bored, he flipped the radio button, located a news broadcast. "--the bombed area did not extend west of the Appalachians. Washington DC was badly hit, as were New York and Philadelphia, and further raids are expected to originate from Siberia, coming across the great circle to the West coast or the Middle west. So far the Enemy appears to have lived up to its agreement in the Ingersoll pact to outlaw use of atomic bombs, for no atomic weapons have been used so far, but the damage with block-busters has been heavy. All citizens are urged to maintain strictest blackout regulations, and to report as called upon in local work and civil defense pools as they are set up. The attack began--"