“A lie, Watson—a great, big, thumping, obtrusive, uncompromising lie—that’s what meets us on the threshold! There is our starting point. The whole story told by Barker is a lie. But Barker’s story is corroborated by Mrs. Douglas. Therefore she is lying also. They are both lying, and in a conspiracy. So now we have the clear problem. Why are they lying, and what is the truth which they are trying so hard to conceal? Let us try, Watson, you and I, if we can get behind the lie and reconstruct the truth. “How do I know that they are lying? Because it is a clumsy fabrication which simply could not be true. Consider! According to the story given to us, the assassin had less than a minute after the murder had been committed to take that ring, which was under another ring, from the dead man’s finger, to replace the other ring—a thing which he would surely never have done—and to put that singular card beside his victim. I say that this was obviously impossible. “You may argue—but I have too much respect for your judgment, Watson, to think that you will do so—that the ring may have been taken before the man was killed. The fact that the candle had been lit only a short time shows that there had been no lengthy interview. Was Douglas, from what we hear of his fearless character, a man who would be likely to give up his wedding ring at such short notice, or could we conceive of his giving it up at all? No, no, Watson, the assassin was alone with the dead man for some time with the lamp lit. Of that I have no doubt at all. “But the gunshot was apparently the cause of death. Therefore the shot must have been fired some time earlier than we are told. But there could be no mistake about such a matter as that. We are in the presence, therefore, of a deliberate conspiracy upon the part of the two people who heard the gunshot—of the man Barker and of the woman Douglas. When on the top of this I am able to show that the blood mark on the windowsill was deliberately placed there by Barker, in order to give a false clue to the police, you will admit that the case grows dark against him. “Now we have to ask ourselves at what hour the murder actually did occur. Up to half-past ten the servants were moving about the house; so it was certainly not before that time. At a quarter to eleven they had all gone to their rooms with the exception of Ames, who was in the pantry. I have been trying some experiments after you left us this afternoon, and I find that no noise which MacDonald can make in the study can penetrate to me in the pantry when the doors are all shut.