All was again silent. Rayner and Oliver tried to look through the bars, but could see nothing; all was still. Again the notes were heard. Jack whistled a few bars of the same air. A voice from below, in a suppressed tone asked in French, “Have you a thin line? Let it down.”

“It is Le Duc. He has got something for us. Maybe just what we want,” cried Jack.

“Oui, oui,” he answered. “It will quickly be ready.”

The ticking of one of the mattresses was quickly cut up and formed into a line, which was lowered. Rayner, who held it, felt a gentle tug, and as he hauled it up, what was the delight of the party to find two strong files! There could be no doubt that Le Duc had formed some plan to assist them in escaping, or he would not have come thus furnished. Probably they had to thank Madame La Roche for suggesting it. They did not stop, however, to discuss the matter, but set to work immediately to file away the bars, making as little noise as possible. While two of them were thus employed, the rest walked about the room, and talked and laughed and sang, so as to drown the sound of the files. Presently they heard from the other side of the building the loud tones of a fiddle, the player evidently keeping his bow going at a rapid rate. Then came the sounds of laughter and the stamping of feet, as if people were dancing.

“Why, our guards will be kept awake and we shall have no chance of getting off, I fear,” said Oliver.

“If our guards dance they will drink, and sleep afterwards, never fear,” answered Rayner. “Our friend Le Duc knows what he is about. I’m sure that we can trust him, or he would not have taken the trouble to bring us these files.”

The fiddle was kept going, and Brown and Jack kept time to the tunes with the files as they worked, laughing heartily as they did so.

“Hurrah!” cried Jack, “there’s one bar through. Take a spell here, Tom. You’ve helped the armourer sometimes, and know how to use a file.”

Tom, being as eager to get out as the rest, worked away better than he did on most occasions.

Jack, however, soon again took the file, and in a short time announced that both the centre bars were cut through at the bottom. They had next to file the upper bars sufficiently to enable Brown to bend them back. Losing patience, however, he at last seized one of them, when, placing his feet against the window, he bent back with all his strength. He was more successful than he expected, for the iron giving way, down he fell on the floor with a tremendous crash, which would certainly have been heard by the guards below, had not their attention been drawn off by the fiddle of Le Duc, who was scraping away with more vehemence than ever. Rayner and Oliver had in the meantime been manufacturing the rope by which they hoped to descend to the ground. They could measure the necessary length by the small line with which the files had been drawn up, and they had the satisfaction of finding that it was amply long enough for their purpose. They now secured it to one of the remaining bars. Rayner and Oliver agreed that it would be wise to descend while the fiddle was going.