"Look at the inner side of the pediment which concealed the hiding-place. The date is written in white chalk: 'Midnight, 24 August.' . . ."
"So it is," muttered the Emperor, nonplussed. "How was it that I did not see?" And he added, betraying his curiosity, "Just as with those two 'N's' painted on the wall. . . . I can't understand. This is the Minerva Room."
"This is the room in which Napoleon, the Emperor of the French slept," said Lupin.
"How do you know?"
"Ask Waldemar, Sire. As for myself, when I was turning over the old servants' diary, it came upon me as a flash of light. I understood that Shears and I had been on the wrong scent. APOON, the imperfect word written by the Grand-duke Hermann on his death-bed, is a contraction not of Apollon, but of Napoleon."
"That's true . . . you are right," said the Emperor. "The same letters occur in both words and in the same order. The grand-duke evidently meant to write 'Napoleon.' But that figure 813? . . ."
"Ah, that was the point that gave me most trouble. I always had an idea that we must add up the three figures 8, 1 and 3; and the number 12, thus obtained, seemed to me at once to apply to this room, which is the twelfth leading out of the gallery. But that was not enough for me. There must be something else, something which my enfeebled brain could not succeed in translating into words. The sight of that clock, situated precisely in the Napoleon Room, was a revelation to me. The number 12 evidently meant twelve o'clock. The hour of noon! The hour of midnight! Is this not the solemn moment which a man most readily selects? But why those three figures 8, 1 and 3, rather than any others which would have given the same total? . . . It was then that I thought of making the clock strike for the first time, by way of experiment. And it was while making it strike that I saw the dots of the first, third and eighth hour were movable and that they alone were movable. I therefore obtained three figures, 1, 3 and 8, which, placed in a more prophetic order, gave the number 813. Waldemar pushed the three dots, the spring was released and Your Imperial Majesty knows the result. . . . This, Sire, is the explanation of that mysterious word and of those three figures 8, 1, 3 which the grand-duke wrote with his dying hand and by the aid of which he hoped that his son would one day recover the secret of Veldenz and become the possessor of the famous letters which he had hidden there."
The Emperor listened with eager attention, more and more surprised at the ingenuity, perspicacity, shrewdness and intelligent will which he observed in the man.
"Waldemar," he said, when Lupin had finished.
"Sire?"