Intro for next weekend's skype game

I am taking my kids camping again this afternoon. I am pretty much all packed and I have included a copy of B/X, a pencil, a pad of paper, and dice. I am going to spend some time fleshing out the dungeon for next week's skype game. Here is the teaser I gave to players,

You found the ancient map on the old dwarf. It was about the only thing that remained intact on the weathered skeleton. His armour was rusted and in tatters and his backpack had long rotted and spilled its contents down into the deep ravine. The map led you to this waterfall that is now above you. You are on a ledge of rock some 10 feet wide with gnarled trees clawing their roots into the hard stone like taloned claws precariously hanging on. The ledge is up against a rough cliff face and is surrounded by the basin into which the waterfall pours. The waterfall spouts out of an opening in the rock face about forty feet above your heads. As you inspect the rock wall you consider the words that were written on the back of the map,

Yazeran, We are four-and-twenty hearty warriors entrapped in the caves of the waterfall. The Orc hordes surround us. Their number is many. We sense the presence of a mighty artefact, perhaps the one I told you of. If you have reached safety with your own charge, and made allies among the humans as we have heard, please send us aid. The thing they have must not remain with them! Nor must our own secret fall into their foul hands. - Ketiger for Hadrin.

Some of you may recognize it from a different game ;)