"All right," he said at last. "I guess there's nothing for it. I'll show you." "Good. I'll arrange for a flier--" Her voice was drowned out by a sudden hooting of sirens all through the Citadel. For a moment no one moved. Linna's face became drained of all color. The guards stiffened, staring in a kind of wonder. The steel shutter of the window clanged to with a ringing snap, and Price could feel in that vast building a stirring and buzzing as of a menaced hive. "What is it?" he asked, his feeling of triumph beginning to slip away almost before he had had time to enjoy it. Linna's voice was quite steady when she answered. "Possibly nothing. You must return to your cell now. We'll discuss the trip later." The sirens stopped. The guards hustled Price along urgently now, as though they had more important things to attend to. The Vurna were shifting rapidly from places to other places, but all in good order. Only their faces were tense and they did not talk except to pass an order or ask for one. It was obvious that there was an alarm, that the Citadel was taking up battle stations, and that everyone was, if not afraid, at least severely uneasy. Price began to be uneasy too. Nevertheless, he noted the symbol that identified the floor, and studied the life-controls as he was dropped down to the prison level again. In perfect silence they stepped from the lift and started down the corridor toward Price's cell. Then the sirens screeched again, but on a different note. Linna gave a little sigh. Without thinking about it, he put his arm around her. "All clear?" "Yes. What a relief. I'm technically a soldier, but I'm afraid a technicality is all it is. I--shh! Listen." A clear metallic voice had begun to speak over some communicator system that apparently reached every corner of the Citadel. Linna drew away from him without seeming to notice his familiarity, listening intently. The guards listened too, and so did three or four other Vurna visible in the corridor. Price could understand nothing, except that the word "Ei" occurred several times. The Vurna's favorite bogeyman. He wondered if the Vurna powers-that-were used it to hoodwink their own people too. It would explain Linna's sincerity, Arrin's honest annoyance, if they themselves believed in a menace called the Ei.