You've just inherited a castle! And now for the bad news... All it needs is a good cleaning out.
Pgs. 6-14 & 36
*You just got a castle! And now for the bad news...*
A player character who has no other living relatives has inherited a small keep from a long-lost uncle. To realize the inheritance, however, the keep must be seized from an unfriendly band of hobgoblins. Moreover, the uncle specialized in illusionist magic, and the keep itself has its share of challenging traps and obstacles.
Dungeon Magazine #026; pgs. 6-14 & 36.
nisioisis has played this adventure and would recommend it.
Succinct while providing a ton of opportunities for further adventures. highly recommended if you want to introduce bastion/stronghold rules for any edition