He had caught the popular attention by the fact that he was still a comparatively young man of five and forty. He had caught the ear and attention of the scientific world by his extraordinary researches into the lesser known powers of electric currents. Moreover, and it is an unusual combination, he was not only an investigator of the lesser known attributes of electricity who could be ranked with Tessler, Edison, or Marconi, but he was a psychologist and pathologist of European reputation. He was said by those who knew to have probed more deeply into mental processes than almost any man of his time, and for two or three years now every one who was on the inside track of things knew that Sir William Gouldesbrough was on the verge of some stupendous discovery which was to astonish the world as nothing else had astonished it in modern years. Eustace Charliewood appeared to be an intimate friend of this great man. He was often at his house, they were frequently seen together, and the reason for this strange combination was always a fruitful subject of gossip. Serious people could not understand what Gouldesbrough saw in a mere pleasant-mannered and idle clubman, of no particular distinction or importance. Frivolous society people could not understand how Mr. Charliewood cared to spend his time with a man who took life seriously and was always bothering about stupid electricity, while in the same breath they rather admired Charliewood for being intimate with such a very important person in England as Sir William Gouldesbrough undoubtedly was. For two or three years now this curious friendship had been a piquant subject of discussion, and both Sir William's and Mr. Charliewood's most intimate friends had spent many pleasant hours in inventing this or that base and disgraceful reason for such a combination. Yet as the cab rolled smoothly up Portland Place Mr. Charliewood did not look happy. He threw his cigar away with a petulant gesture, and watched a street arab dive for it among the traffic with a sneer of disgust. He unbuttoned his heavy astrachan coat; it felt tight across his chest, and he realized that his nerves were still unstrung, despite the efforts of the morning. Then he took a cheque-book from his pocket and turned over the counterfoils till he came to the last balance. He frowned again, put it away, and once more leant back with a sigh of resignation. In a few more minutes the cab drew up at a brick wall which encircled a large house of red brick, a house built in the Georgian period. Only the top of the place could be seen from the street, as the wall was somewhat unusually high, while the only means of entrance was a green door let into the brickwork, with a brass bell-pull at one side. In a moment or two the door opened to Charliewood's ring, and a man-servant of the discreet and ordinary type stood there waiting. "Good afternoon, sir," he said. "Sir William expects you."