At the doorway of the building that combined the home and laboratory of Dr. Felder, Wayne Randall almost changed his mind. Then he said, "What the devil. Why not?" and rang the bell. It would, he hoped, embark him on a great adventure—an adventure into a strange world he had never known. A red-headed girl in a white uniform answered the ring. Wayne caught his breath at the fresh clean beauty of the face framed by the sleek, wavy, auburn hair. At the contrast of that hair with the blue eyes. And