“No, but are you sure you can find the way out?”
“With my eyes closed.”
At first, they descended twelve steps, then twelve more, and, farther on, two other flights of twelve steps each. Then they walked through a long passageway, the brick walls of which showed the marks of successive restorations, and, in spots, were dripping with water. The earth, also, was very damp.
“We are passing under the pond,” said Devanne, somewhat nervously.
At last, they came to a stairway of twelve steps, followed by three others of twelve steps each, which they mounted with difficulty, and then found themselves in a small cavity cut in the rock. They could go no further.
“The deuce!” muttered Holmes, “nothing but bare walls. This is provoking.”
“Let us go back,” said Devanne. “I have seen enough to satisfy me.”
But the Englishman raised his eye and uttered a sigh of relief. There, he saw the same mechanism and the same word as before. He had merely to work the three letters. He did so, and a block of granite swung out of place. On the other side, this granite block formed the tombstone of Duke Rollo, and the word “Thibermesnil” was engraved on it in relief. Now, they were in the little ruined chapel, and the detective said:
“The other eye leads to God; that means, to the chapel.”
“It is marvelous!” exclaimed Devanne, amazed at the clairvoyance and vivacity of the Englishman. “Can it be possible that those few words were sufficient for you?”