`Prove it to me! Prove it to me! And if you can do so - !' The fierce flash of her eyes said more than any words.

`I have come prepared to do so,' said Holmes, drawing several papers from his pocket. `Here is a photograph of the couple taken in York four years ago. It is indorsed ``Mr. and Mrs. Vandeleur,'' but you will have no difficulty in recognizing him, and her also, if you know her by sight. Here are three written descriptions by trustworthy witnesses of Mr. and Mrs. Vandeleur, who at that time kept St. Oliver's private school. Read them and see if you can doubt the identity of these people.'

She glanced at them, and then looked up at us with the set rigid face of a desperate woman.

`Mr. Holmes,' she said, `this man had offered me marriage on condition that I could get a divorce from my husband. He has lied to me, the villain, in every conceivable way. Not one word of truth has he ever told me. And why - why? I imagined that all was for my own sake. But now I see that I was never anything but a tool in his hands. Why should I preserve faith with him who never kept any with me? Why should I try to shield him from the consequences of his own wicked acts? Ask me what you like, and there is nothing which I shall hold back. One thing I swear to you, and that is that when I wrote the letter I never dreamed of any harm to the old gentleman, who had been my kindest friend.'

`I entirely believe you, madam,' said Sherlock Holmes.

`The recital of these events must be very painful to you, and perhaps it will make it easier if I tell you what occurred, and you can check me if I make any material mistake. The sending of this letter was suggested to you by Stapleton?'

`He dictated it.'

`I presume that the reason he gave was that you would receive help from Sir Charles for the legal expenses connected with your divorce?'

`Exactly.'

`And then after you had sent the letter he dissuaded you from keeping the appointment?'

`He told me that it would hurt his self-respect that any other man should find the money for such an object, and that though he was a poor man himself he would devote his last penny to removing the obstacles which divided us.'

`He appears to be a very consistent character. And then you heard nothing until you read the reports of the death in the paper?'

`No.'

`And he made you swear to say nothing about your appointment with Sir Charles?'

`He did. He said that the death was a very mysterious one, and that I should certainly be suspected if the facts came out. He frightened me into remaining silent.'

`Quite so. But you had your suspicions?'

She hesitated and looked down.

`I knew him,' she said. `But if he had kept faith with me I should always have done so with him.'