New York, Walker, 1973. First American edition. If there were a device that created silence, a jet taking off, a factory, the roar of a waterfall, all absolutely silent. A blessing? What if the cost were the permanent loss of freedom? Dr. Palfrey and the Z-5 unit must balance the two opposing forces. Apparent faint tape removal marks to boards. Staining to front endpaper, DJ shows blue stripes common to books with Brodart covers. $7.50.