The music was proceeding quite smoothly, though with pauses now and again. It was followed now and then by what sounded like subdued applause.
Jack stepped back from the window. He wanted to make certain that he had not mistaken the room. No, the sounds of music came from the study right enough. At the risk of being discovered he crept back into the house again and tried the study door. It was locked, and what was more, the key was in the lock, as the application of an eye testified.
And the music was proceeding quite swiftly again. The mystery was absolutely maddening. Jack wondered if there was some cabinet in the study hidden from view where the player had taken up his stand. At any rate somebody was playing Chopin's music--playing it very well. There was no magic about the thing.
The hall of the house was very quiet, nobody seemed to be about. Occasionally there came the sound of mirth from the servants' hall, but nothing more. Fully determined to get to the bottom of this mystery, Jack returned to the garden again. Once more his eye was glued to the slit in the blind. He could make nobody out in the room. There was little fear of his being detected, because a belt of shrubs hid the window from the road.
Without the slightest warning a figure appeared in the room. It was impossible to see where she came from, but of necessity she must have entered by the door. Jack was a little uncertain on that head, for his glance was not directed towards the door for the moment.
He saw the figure of a woman, young and exceedingly well dressed. She was wearing an evening gown of white satin that showed up the creamy pallor of her skin, for her neck and shoulders were bare. The neck was rather thin, Jack noted, and the shoulders more inclined to muscle than beauty. For a young girl it struck Jack that the upper part of her body looked old. But the face was dark and wholesome, and against the deep eyes and swarthy complexion the girl's hair was dazzling. It was beautiful, rippling hair, changing color as the light flashed upon it.
"Well, this is a bit of an adventure," the watcher told himself. "But where's the person in the room who let the young lady in? Somebody must have let her in, because the door was locked and the key on the inside. I saw it there, so I can swear to that fact. But who is she?"
There were many answers to the problem, for Spencer Anstruther was a man who had countless strange visitors. His vast knowledge of crime and the ramifications of human depravity brought him in contact with large numbers of people. Men and women in distress often came to him, and they came in increasing numbers since Anstruther had got the better of a gang of scoundrels in a recent famous blackmailing case. Sometimes these people came on their own initiative, sometimes they were sent by the police. But Anstruther never said anything about them. He looked upon himself as a confidential agent. Claire could have told of many curious visitors at all hours, though Anstruther never so much as alluded to them afterwards.
But this girl did not look in the least like anybody in trouble. Her dark features were almost expressionless; there was no display of violent emotions there. Her gaze slowly wandered round the room as if looking for something; she had much the aspect of a pupil whose attention is called to a blackboard by a master. As Jack watched, it seemed to him that he had seen this girl before. He could not recollect anybody in the least like her; that contrast of dark skin and fair hair was striking enough to impress itself upon the most careless mind, and yet Jack could not give the face a name. He could not permit himself to believe that he had made a mistake. He knew perfectly well that the expressionless features were quite familiar to him.
The girl stood for some little time, as if waiting for her lesson. Jack's eyes were glued so closely upon her that he did not notice the coming of another person--a man this time. He was a young man, with sleek, well-brushed brown hair, and dark, well-groomed moustache turned up after the fashion affected by the German Emperor. The man was perfectly well appointed, his evening dress and white waistcoat were faultless. His face was strong, but it did not convey anything intellectual. There were scores of such men to be seen any day during the London season, all groomed the same, all apparently finished in the same machine.