I'm not sure specifically as there could be many novels with this title or a similar concept. It might be about a housekeeper who has to manage a dungeon, perhaps dealing with strange creatures, maintaining order in a spooky and underground place, and facing various challenges unique to that setting.
Well, the obvious main character would be the housekeeper. There might be other characters such as the inmates or prisoners in the dungeon if it's that kind of a dungeon. There could also be guards or helpers who interact with the housekeeper. Maybe there's a mysterious figure who lurks in the deeper parts of the dungeon that the housekeeper eventually crosses paths with.
I think power dynamics is a significant theme. There may be different levels of power among the characters, like the housekeeper might have a certain power within the dungeon context. Also, loyalty could be a theme. Characters might need to decide who they are loyal to in this dangerous and complex environment. In addition, there could be a theme of self - discovery. As the story progresses, the characters may learn more about themselves and their capabilities in the face of the challenges presented by the dungeon.
A rental housekeeper manga often has interesting storylines that focus on the interactions between the housekeeper and the client. The characters might have unique personalities and challenges to overcome.
Well, 'The Goblin Emperor' has some elements of a unique world - building like 'the housekeeper in the dungeon novel'. It presents a complex society and a main character who has to navigate through it. Another one could be 'The Name of the Wind'. It has a richly detailed world and a protagonist with an interesting backstory, much like the characters in 'the housekeeper in the dungeon novel'.