“You said you had a clue?”

“Well, we have several, but we can only test their value by further inquiry. The most difficult crime to track is the one which is purposeless. Now this is not purposeless. Who is it who profits by it? There is the French ambassador, there is the Russian, there is whoever might sell it to either of these, and there is Lord Holdhurst.”

“Lord Holdhurst!”

“Well, it is just conceivable that a statesman might find himself in a position where he was not sorry to have such a document accidentally destroyed.”

“Not a statesman with the honorable record of Lord Holdhurst?”

“It is a possibility and we cannot afford to disregard it. We shall see the noble lord today and find out if he can tell us anything. Meanwhile I have already set inquiries on foot.”