quite satisfied a material and physical explanation exists for this unfortunate event," he said. "I need hardly tell you that I am unprepared to entertain any supernatural theory of the business. I don't believe myself in ghosts, because in my experience, and it is pretty wide, ghost stories break down badly under anything like skilled and independent examination. There is a natural reason for what has happened, as there is a natural reason for everything that happens. We talk of unnatural things happening, but that is a contradiction in terms. Nothing can happen that is not natural. What we call Nature embraces every conceivable action or event or possibility. We may fail to fathom a mystery, and we know that a thousand things happen every day and night that seem beyond the power of our wits to explain; but that is only to say our wits are limited. I hold, however, that very few things happen which do not yield an explanation, sooner or later, if approached by those best trained to examine them without predisposition or prejudice. And I earnestly hope that this tragic business will give up its secret."
"May you prove the correctness of your opinions, Mr. Hardcastle," answered Sir Walter. "Would you like to see the Grey Room now?"
"I should; though I tell you frankly it is not in the Grey Room that I shall find what I seek. It does not particularly interest me, and for this reason. I do not associate Captain May's death in any way with the earlier tragedy—that of the hospital nurse, Mrs. Forrester. It is a coinci-
