Exactly what happened at Crystal Caves? I don't remember exactly what the story is behind it. I think it was when the kids snuck off to go hiking without permission, and was it a flood that got them? "Andre" had actually switched identites with his brother, who died while trying to cross a crevice on a vine....was there a large spider involved? No one knew that Andre had actually not been the twin to fall, and was in such a horrible mental state that he refused to come clean about it. It stayed a secret for a very long time...much guilt was involved on his part.
Bobby McKee? don't know what happened to him, think that was where the flood came into play, he was washed away into one of the caverns.
How did the adventure end? I recall something about a large lake, and a waterfall or something...and can't place exactly what happened.

Who else went with Andre and Bobby to Crystal Caves?