When the concealed gong sounded, the man sitting on the floor sighed. He continued, however, to slump loosely against the curving, pearly plastic of the wall, and took care not to glance toward the translucent ovals he knew to be observation panels. He was a large man, but thin and bony-faced. His dirty gray coverall bore the name “Barnsley” upon grimy white tape over the heart. Except at the shoulders, it looked too big for him. His hair was dark brown, but the sandy ginger of his two-week bear