Page:The House of Souls.djvu/505

 'There is some justice in what you say,' said Dyson. 'As I understand you, then, you think that your Italian, having murdered Vivian, kindly chalked up that hand as a guide to Scotland Yard?'

'Why not? Remember a murderer is always a madman. He may plot and contrive nine-tenths of his scheme with the acuteness and the grasp of a chess-player or a pure mathematician; but somewhere or other his wits leave him and he behaves like a fool. Then you must take into account the insane pride or vanity of the criminal; he likes to leave his mark, as it were, upon his handiwork.'

'Yes, it is all very ingenious; but have you read the reports of the inquest?'

'No, not a word. I simply gave my evidence, left the court, and dismissed the subject from my mind.'

'Quite so. Then if you don't object I should like to give you an account of the case. I have studied it rather deeply, and I confess it interests me extremely.'

'Very good. But I warn you I have done with mystery. We are to deal with facts now.'

'Yes, it is fact that I wish to put before you. And this is fact the first. When the police moved Sir Thomas Vivian's body they found an open knife beneath him. It was an ugly-looking thing such as sailors carry, with a blade that the mere opening rendered rigid, and there the blade was all ready, bare and gleaming, but without a trace of blood on it, and the knife was found to be quite new; it had never been used. Now, at the first glance it looks as if your imaginary Italian were just the man to have such a tool. But consider a moment. Would he be likely to buy a new knife ex-