A needle gun pointed through the cell bars at the hulking form of Edward Snyder, his blue-furred Moon mimic squirming on his lap. Behind it were the cold hands, cropped black hair, and bloodless face of Lt. Mike Logan. It had taken him three hours to slide past the guards of the transient prison. He would leave with the same efficient caution. But first he had to kill! Snyder looked up and saw him. The flabby face twisted cynically. "Something personal, Lieutenant, or does the gun make it offici