They now made their way along to the end of the roof. The grapnel was fixed, and Edgar slid down the rope to the next roof, which was some fifteen feet below them. They did not attempt to free the grapnel, fearing that in its fall it might make a clatter; they therefore used another to mount to the next house, which was as high as that which they had left. There was but a difference of four feet in the height of the next, and they had not to use the grapnel again until they reached the sixth house, which was ten feet below that next to it.