Giles walked fast. The mist had become thicker than before, but the path was a good one. From time to time he checked his route on the map. Soon the path led him down a very steep hillside. In the mist, Giles could see only a few feet ahead, so he moved very carefully. Suddenly his foot turned on a sharp stone and he almost fell. That stone probably saved his life. It flew up from under his feet and rolled down the steep path. He heard it rolling faster and faster, then the noise stopped. A few seconds later Giles heard a crash as the stone hit the ground hundreds of feet below. The path had led him to the edge of a cliff! Giles picked up another stone and dropped it. Again he heard the distant crash as it fell over the cliff. He looked at the map again. There was no cliff on the route that the old man had shown him. For the first time, Giles became seriously worried. He sat down miserably on a large rock, took out his pipe, and found a match to light it. `Well,' he thought, `I'll just have to sit and wait for the mist to clear.'