It was all too clear, now. I remembered the day we had met Krassner, seen him "shot down" by an enemy plane. I remembered MacGregor's comment at the time. "Damned funny. First Totie I ever saw who didn't gun a parachuter." And that day I had caught him listening to us from Mallory's outer office. His restless wanderings around the laboratory grounds; now I knew he had been seeking the hide-away of the _Jefferson_. And the betraying rifle-shot-- "You Americans are a naïve race," Krassner was saying amusedly. "It never occurred to you, did it, O'Shea, that I might have concealed on me a portable transmitter? It was I who exposed the location of the laboratory to our gallant forces. We had suspected for some time that strange things were brewing near Cleft Canyon. That is why I--shall we say 'dropped into the picture'? To learn the meaning of certain things that puzzled us." He was a braggart, like the rest of them. Now that he had given himself away--only Toties swore "by the Banner"--he was gloating triumphantly. And he held the upper hand. We could not even tell him that which we knew; that Earth was doomed, that already hundreds of thousands of his compatriots as well as ours by quiescent in dreadful, sleeping undeath. If he discovered the Totie cause was lost--well, they were ever ones for the heroic, the vainglorious gesture. And his hand controlled forces that would blast us all into nothingness. * * * * * I glanced about me nervously. The faces of the men mirrored my anxiety, Mallory's brow was heavy with fear, Van Huys gnawed his full lower lip savagely. Only the gleaming metalwork of the corridor was impassive; that and the heavy door that barred us from a traitor and an enemy. A grilled square, high in the walls of the corridor, was like a great, fanged, laughing mouth. I stared at it. "Mallory!" I whispered the name. "What is that?" "Eh?" He followed my glance. "Oh--that? Part of the ventilation system. But, why--?" Then he grasped the reason for my sudden eagerness. "Yes, Brian. It feeds into every chamber. We'll give you a hand. Bruce--" Krassner's voice came to us, suspicious. "What are you whispering about out there? I warn you, don't attempt to enter this room. If you do, we'll all die together!" Mallory somehow managed to keep his tone steady. "Krassner, you're an intelligent man. Listen--" "Keep him talking, Doctor!" I whispered. I nodded to MacGregor; his huge hands cupped to give me a hand-up to the grill. My fingers tore at the four studs that bolted it into position. One came out. Another. All eyes were upon me as I lifted the heavy grill from its position, lowered it into the outstretched hands. Only Mallory continued talking, pleading, arguing, reassuring. Stalling for precious time.