“Thanks, I’ll do my best, Bill.”

“Start climbing.” His voice came from above her head and she felt a jerk on the rope. “This chimney is a fissure in the cliff, and it slants slightly upward, thank goodness. Reach above and get handholds on the rock projections first. Then pull yourself up, until you find a foothold. When you put your weight on your feet, press your legs against the side walls. That will keep you from slipping. Take it easy and rest as much as you like. This kind of thing can only be done slowly.”

“I’m coming,” Dorothy said quietly and she pressed her body into the niche she could not see.

“That’s the stuff! I’ll rest while you climb. And while you’re doing it, I’ll keep the rope taut and out of your way.”

Dorothy was silent. Groping in the darkness above her head, her fingers came in contact with a rough projection. It was little more than a small knob in the rocky side of the chimney, but she managed to get a firm grip on it with her right hand. Her left found another projection slightly lower on the other side. She exerted all her strength and slithered upward.

Drawing her knees up she sought rests for her feet on the sides, but the rock seemed absolutely smooth. For an instant she was at a loss. Then remembering Bill’s advice, she pressed her legs against the chimney walls and pushed.

That her body moved upward so easily came as a surprise. It was hard to realize that sheer walls would give such a purchase. Almost at once her shoulders were above the hand holds and she could raise herself by pressing downward until her left knee was planted on the same projection that she had gripped with that hand.

Braced firmly against the rock, she looked for higher hand holds, found them and soon was able to get her left foot on to the place where her knee had been. With her weight on that foot, it became a simple matter to plant her right in the opposite niche. Straightening her body, she lay forward against the slanting cliff and rested.

“Go ahead, Bill,” she called in a low voice as soon as she could speak.

“O.K., kid,” came the prompt reply from overhead. “On my way.”