corridors blasting open doors as he came to them. At last he found what he sought behind the gaping maw of a blasted panel. Through the coalescing haze of the vaporized door he saw stairs spiralling upward.

He was about to enter when he saw the first tendrils of smoky whiteness reaching for him and plucking at him. Instantly he realized that the heavy stuff was being forced down the stairwell. Holding his breath, he retreated back down the corridor and let loose a blast from the weapon cradled in his arms in an effort to seal up the shattered door. As he retraced his steps back to the elevators, he realized that his head was getting heavy. Vaguely he noticed the milky smoke issuing from the corridor vents and he began to run.

But with each step his body became heavier and heavier and only the greatest effort of will kept him from collapsing on his face. He knew he was trapped. Desperately he goaded his tired mind to discover a means to escape. Reeling, he reached the elevators, dimly conscious of Gutridge's mocking laugh far down the corridor. The white haze was thick and nauseating and it caressed his nostrils with cloying sweetness.

Suddenly Pell saw a group of masked figures approach in the sound-deadening haze. In what seemed an eternity he brought the blaster up with tired hands and pressed the stud. As if in some horrible nightmare, the figures seemed to shimmer and explode.

Desperately Pell strived to keep his legs under him, but they wobbled in spite of his control and he fell. His arms and legs were mere dead weight; he could no longer force them to do his bidding, not even to the extent of releasing the stud on the blaster. A wave of heat struck him mightily on the face, as if he had been thrust bodily into an atomic furnace. Then from somewhere a draught of cool, pure air played about him, washing the fumes of the nerve gas from his system.

Astounded, Pell gasped in deep lungfuls of the precious air and painfully stumbled to his feet. Slowly the incredible truth dawned upon him. Accidentally he had blasted open the sliding steel door of the elevator shaft and the cool breath of its untainted air had revived him. Hastily he looked around him, trying to spot more of the enemy creeping through the dense fog toward him. There were none; apparently they had decided to let the gas do its work. They were in for a surprise, Pell reflected.

An idea had occurred to him. He might just possibly escape the trap by climbing up the inside of the elevator shaft. He strained his eyes into the 

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