Used paperback in good condition. Cover and pages show minimal wear. Pages with normal age discolouration. 230 pages. Published by Sphere Books, 1977. ISBN 0 7220 2216 0.

Harrigan heard the fire door swing shut with a loud clang, and frowned. Then he heard another sound. A cough. "Who's that?" Harrigan swung round towards the door, trying to focus the puny beam of the inspection lamp in the direction from which he thought the sound had come. The beam picked out the blurred outline of someone crouching in the corner of the chamber by the fire door. "Is that you, Sean?" Harrigan called. Then he steadied the beam on the crouching man. The face was not he knew. Harshly, he asked, "I said who are you? You've no business to be in here. Are you from the factory? The crouching man made no reply, but one of his hands moved swiftly through the gloom. There was a soft click and then a searing white explosion of light flashed across the few feet of floor separating the two men.