After this it was comparatively easy work, though a stoppage was necessary at each landing. At last, to their satisfaction, they found themselves in a flagged passage, and knew that they were on the ground floor. They made their way along the passage, and soon reached the door. It was locked with so massive a fastening that it would have been difficult to unfasten it from the outside; but with the aid of the chisel they had but little difficulty in forcing back the lock. They paused for a minute to listen, as a passer-by might have been startled by the sound of the bolts being shot in an empty house. All was quiet, however, and, opening the door cautiously, Edgar stepped out.