Castle in the Clouds is a 1st edition adventure from the "
Old School Role Playing" company aka Joseph A. Mohr, who has produced a surprisingly large number of adventures (17 by my count) as well as a book of magic items, Malcon's Tome of Magic. I've got the latter but this is the first of his adventures I've bought. It goes for $3.50 and 25 or so pages, but it seems a bit pricey for what you get in terms of the adventure itself, it's more a mini-adventure with only about a dozen locations. The rest is mostly filler.
It's a case of where the title does describe the modules, it's set in a cloud giant's cloud castle. That has always been of of my favorite adventure ideas and it's largely been underutilized, I think. There was that goofy JG module with the balloon people, a couple decent Dungeon magazine adventures, but for something so much a part of folklore (Jack and the Beanstalk) and
even music, it seems largely ignored. Compare it to Baba Yaga, who is much more obscure, yet her hut shows up all the time.
