LAURA BURK twisted the point of the broad-bladed implement into the crevice of a rock. The pressure she exerted on the blade began to bend the tool's shank. It was early afternoon and very hot on the Hawksnest Point trail. Her khaki shirt was soaked with moisture, and the perspiration from her brow blurred her vision momentarily. Retrieving a towel from her bag she wiped her face. Even the grounds crew at the hotel did not work during this part of the day, but Miss Burk, who appeared to have the strength of a man, was determined.
Rummaging around in the bag, she extracted a long, thin-bladed knife and began to probe deftly along the same surface of the rock. She then examined her efforts and, taking a small brush of the sort a painter might use, whisked away the scrapings. Once again she stared at the surface and a smile of satisfaction crossed her lips. She picked up the small camera lying on the rubberoid sheet by her knees and prepared to photograph the results of her efforts.
But before she could snap the picture, she suddenly turned her head in the direction of the trail. Was it her imagination, or did she hear the sound of someone ap-