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I agree with the posters who recommended the Dungeon Crawl Classics line. The modules are generally easy to fit into a campaign, and the stories are easily altered to accomodate your own plot.
... a lot of the adventures have dungeons that I've used to rip out and use in a different context... And of course, there's Maure Castle, which is exactly what you want.
... a lot of the adventures have dungeons that I've used to rip out and use in a different context... And of course, there's Maure Castle, which is exactly what you want.
Most of what I have heard about Rappan Athuk (original or Reloaded) seems to support this concept - it is not designed to be run as a straight through dungeon crawl, but rather the DM comes up with missions to give reasons for the PCs to make hit and run descents into its darkness.