He did not, of course, enumerate them in his mind, as I had done, for he was not aware of all the facts. The Seven Secrets, as they presented themselves to me, were: First, the identity of the secret assassin of Henry Courtenay; second, the manner in which that extraordinary wound had been caused; thirdly, the secret of Ethelwynn, held by Sir Bernard; fourthly, the secret motive of Ethelwynn in remaining under the roof of the man who had discarded her in favour of her sister; fifthly, the secret of Courtenay's reappearance after burial; sixthly, the secret of the dastardly attempt on my life by those ruffians of Lisson Grove; and, seventhly, the secret of Mary Courtenay's death. Each and every one of the problems was inscrutable. Others, of which I was unaware, had probably occurred to my friend. To him, just as to me, the secrets were seven. "Now, be frank with me, Ambler," I said, after a long pause. "You've gained knowledge of some of them, haven't you?" By his manner I saw that he was in possession of information of no ordinary character. He paused, and slowly twisted his small dark moustache, at last admitting---- "Yes, Ralph, I have." "What have you discovered?" I cried, in fierce eagerness. "Tell me the result of your inquiries regarding Ethelwynn. It is her connection with the affair which occupies my chief thoughts." "For the present, my dear fellow, we must leave her entirely out of it," my friend said quietly. "To tell you the truth, after announcing my intention to give up the affair as a mystery impenetrable, I set to work and slowly formed a theory. Then I drew up a deliberate plan of campaign, which I carried out in its entirety." "And the result?" "Its result--" he laughed. "Well, when I'd spent several anxious weeks in making the most careful inquiries, I found, to my chagrin, that I was upon an entirely wrong scent, and that the person I suspected of being the assassin at Kew was innocent. There was no help for it but to begin all over again, and I did so. My inquiries then led me in an entirely opposite direction. I followed my new and somewhat startling theory, and found to my satisfaction that I had at length struck the right trail. Through a whole fortnight I worked on night and day, often snatching a few hours of sleep in railway carriages, and sometimes watching through the whole night--for when one pursues inquiries alone it is frequently imperative to keep watchful vigil. To Bath, to Hereford, to Edinburgh, to Birmingham, to Newcastle, and also to several places far distant in the South of England I travelled in rapid succession, until at last I found a clue, but one so extraordinary that at first I could not give it credence. Ten days have passed, and even now I refuse to believe that such a thing could be. I'm absolutely bewildered by it." "Then you believe that you've at last gained the key to the mystery?" I said, eagerly drinking in his words.