Mark was afraid of heights, and he wasn't too sure-footed. But he was unable to resist a dare, which was how he had found himself here - in really big trouble! Afraid to look either up or down, he felt above his head for the next branch, but there was nothing. He felt around for his next foothold, but everything felt to weak and flimsy. He had to be near the top. There was nowhere else to go. Reluctantly, his heart pounding, and his lunch threatening to come back up, Mark opened his eyes and looked down to see Adam-the size of an ant-waving at him. Was that the thumb's up? He was so high up. Mark couldn't be sure. What is the setting?

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