There was one occasion in particular. It was about ten o'clock. The Jetsons had been spending the evening with the Hepworths, and were just on the point of leaving, when there came a sudden, clear knock at the door. It turned out to be Jetson's foreman, who had to leave by an early train in the morning, and had found that he needed some further instructions. But the terror in Hepworth's face was unmistakable. He had turned a look towards his wife that was almost of despair; and it had seemed to the Jetsons--or, talking it over afterwards, they may have suggested the idea to each other--that there came a flash of contempt into her eyes, though it yielded the next instant to an expression of pity. She had risen, and already moved some steps towards the door, when young Hepworth had stopped her, and gone out himself. But the curious thing was that, according to the foreman's account, Hepworth never opened the front door, but came upon him stealthily from behind. He must have slipped out by the back and crept round the house. The incident had puzzled the Jetsons, especially that involuntary flash of contempt that had come into Mrs. Hepworth's eyes. She had always appeared to adore her husband, and of the two, if possible, to be the one most in love with the other. They had no friends or acquaintances except the Jetsons. No one else among their neighbours had taken the trouble to call on them, and no stranger to the suburb had, so far as was known, ever been seen in Laleham Gardens. Until one evening a little before Christmas. Jetson was on his way home from his office in the Finchley Road. There had been a mist hanging about all day, and with nightfall it had settled down into a whitish fog. Soon after leaving the Finchley Road, Jetson noticed in front of him a man wearing a long, yellow mackintosh, and some sort of soft felt hat. He gave Jetson the idea of being a sailor; it may have been merely the stiff, serviceable mackintosh. At the corner of Laleham Gardens the man turned, and glanced up at the name upon the lamp-post, so that Jetson had a full view of him. Evidently it was the street for which he was looking. Jetson, somewhat curious, the Hepworths' house being still the only one occupied, paused at the corner, and watched. The Hepworths' house was, of course, the only one in the road that showed any light. The man, when he came to the gate, struck a match for the purpose of reading the number. Satisfied it was the house he wanted, he pushed open the gate and went up the path.