radiation-proof garments. The body was hard to lift, but with a minimum of noise and bustle, he got it to the slab, replaced the canvas covering. For jewelled seconds, he waited to see if this disturbance had been noted from the alcove.

Steeling himself to patience, Alston pretended to continue the task of the attendant, working his way from slab to slab and slowly edging toward the swing doors at the end of the loft. It was a grueling, nerve-tightening process. At the last slab he paused, darting a quick survey at the activities within the far alcove. Attention there seemed to be focused upon an immense vat in which flickering lights played. Boldly, Alston stepped through the door.

From a small landing a spiral ramp descended. It was the one visible exit. As he remembered, the clinical laboratories and dissecting rooms occupied the two top floors, beneath the landing stages on the roof of the VE Building. Apparently there was no direct outlet to the roof from this landing. He would have to risk a descent to the office-floors below. It was a long chance, garbed as he was, but there seemed no help for it. His robes and cowl might disguise him but they were sure to attract attention. He must get other clothes somehow before making his break.

His previous escape plan dealt with the underground tunnels connecting the various buildings. Now a new plan must be made up as he went along, grasping whatever opportunity arose. Probably the best trick would be to reach the roof-landings by elevator and try to steal a 'copter.

Down the ramp he went, abandoning stealth. The first landing he reached was empty, but seemed to open into laboratory rooms. Down again. The ramp opened into a corridor leading to a central landing. Alston tried to remember if Hailard's office were on the floor just under the lofts. At any rate, there were elevators here.

Pressing a stud, he waited for the whine of the car. One was ascending, but he could not guess how close it was. Waiting, he pressed close against the wall, out of vision range of the opening door. A weapon would be a help, but he might as well wish for the moon.

A hiss of releasing air announced the elevator cage. Silently the door opened, and a humanoid robot emerged. Blank but sensitive metallic eyes fixed on Alston.

Suddenly alarms rang through the echoing corridors. A blinker red signal flashed in the cage, its reflection a splash of blood on the polished frame. The robot hesitated, reaching 

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