Sam walked through the door, seeing no other visible way into or out of the bare-walled cubicle of a room. The only piece of furniture was a steel-framed chair fitted with soft, slick cushions. When he sat down, the door closed, apparently of itself, and he heard the lock engage. Sounds from the street had filtered into the shop, but no trace disturbed the quiet of this little room. He waited patiently for five minutes, by his watch. Then he waited another ten impatiently before a voice spoke to him.