Then rising, strengthened and supported, they looked carefully about them, and Gaston, grasping his brother by the arm, pointed through the trees and said:
"The water, the water! sure I see a gleam of moonlight upon it! We have reached the fish ponds, I verily believe! Now for the secret way to the house!"
It was true enough. A few steps brought them to the margin of a large piece of water, which was something between a lake and a series of fish ponds, such as are so often seen by old houses. Once the lake had plainly been larger, but had partially drained away, and was now confined to various levels by means of a rude dam and a sort of gate like that of a modern lock. Still the boys could trace a likeness to the lake of their mother's oft-told tale, and by instinct they both turned to the right as they reached the margin of the water, and threaded their way through the coarse and tangled sedges, decaying in the winter's cold, till they reached a spot where brushwood grew down to the very edge of the water, and the bank rose steep and high above their heads.
Gaston was a step in advance, Raymond following at his heels, both keenly eager over the quest. An exclamation from the leader soon showed that something had been discovered, and the next minute he had drawn aside the sweeping branches of a great willow, and revealed a dark opening in the bank, around which the giant roots seemed to form a protecting arch.
"This is the place," he said, in a muffled whisper. "Raymond, hast thou the wherewithal to kindle the torch?"
The boys had not come unprovided with such things as were likely to prove needful for their search, and though it was a matter of some time to obtain a light, they were skilful and well used to the process, and soon their torch was kindled and they were treading with cautious steps the intricacies of the long and tortuous passage which plainly led straight to the house.
"We never should have found it but for our mother's story," said Gaston, with exultation in his voice. "Raymond, methinks that this is the first step in our career of vengeance. We have the key to Basildene in our hands. It may be that upon another occasion we may use it with a different purpose."
It seemed to the brothers that they had walked a great distance, when their steps were arrested by what appeared in the first instance to be a solid wall of stone. Had they not had some sort of clue in their heads, they would certainly have believed that this natural tunnel ended here, and that further progress was impossible. But as it was, they were firmly convinced that this was but the door of masonry of which their mother had told them in years gone by. Neither could recollect the story save in fragments; but the numbers had clung to Gaston's tenacious memory, and now he stood before the door saying again and again -- "Seven from the top, three from the bottom" -- scanning the wall in front of him with the keenest glances all the while.
"Ha!" he exclaimed at length; "bring the torch nearer, Raymond. See here. This is not one block of stone, as seems at first, but a mass of masonry so cunningly joined together as to look like one solid piece. See, here are the joints; I can feel them with my fingernail, though I can scarce see them with my eyes. Let us count the number of the stones used. Yes; there are nine in all from top to bottom, each of the same width. Therefore the seventh from the top is the third counting from the bottom. This is the stone which is the key."
So saying, Gaston set his knee against it and pressed with all his might. Almost to his own surprise he felt it give as he did so, and Raymond uttered a short cry of astonishment: for the whole of what had looked like a solid wall revolved slowly inwards, revealing a continuation of the passage which they had been traversing so long, only that now the passage was plainly one in the interior of the house; for the walls were of masonry, and the dimensions were far more regular.