“You can write me down an ass this time, Watson,” said he. “This was not the bird that I was looking for.”
“Who is he?” asked Mycroft eagerly.
“The younger brother of the late Sir James Walter, the head of the Submarine Department. Yes, yes; I see the fall of the cards. He is coming to. I think that you had best leave his examination to me.”
We had carried the prostrate body to the sofa. Now our prisoner sat up, looked round him with a horror-stricken face, and passed his hand over his forehead, like one who cannot believe his own senses.
“What is this?” he asked. “I came here to visit Mr. Oberstein.”
“Everything is known, Colonel Walter,” said Holmes. “How an English gentleman could behave in such a manner is beyond my comprehension. But your whole correspondence and relations with Oberstein are within our knowledge. So also are the circumstances connected with the death of young Cadogan West. Let me advise you to gain at least the small credit for repentance and confession, since there are still some details which we can only learn from your lips.”
The man groaned and sank his face in his hands. We waited, but he was silent.
“I can assure you,” said Holmes, “that every essential is already known. We know that you were pressed for money; that you took an impress of the keys which your brother held; and that you entered into a correspondence with Oberstein, who answered your letters through the advertisement columns of the Daily Telegraph. We are aware that you went down to the office in the fog on Monday night, but that you were seen and followed by young Cadogan West, who had probably some previous reason to suspect you. He saw your theft, but could not give the alarm, as it was just possible that you were taking the papers to your brother in London. Leaving all his private concerns, like the good citizen that he was, he followed you closely in the fog and kept at your heels until you reached this very house. There he intervened, and then it was, Colonel Walter, that to treason you added the more terrible crime of murder.”
“I did not! I did not! Before God I swear that I did not!” cried our wretched prisoner.
“Tell us, then, how Cadogan West met his end before you laid him upon the roof of a railway carriage.”