D&D General - Horror or Murder Mystery Set in a Noble Villa?

I'm looking for suggestions for published adventures with horror or mystery themes set in a mansion, castle, villa, etc.

Basically, I think my group may wind up at the party thrown by the—SPOILER ALERT, WATERDEEP DRAGON HEIST—Cassalanters where 100 guests will be sacrificed to Asmodeus. If there's any published work out there that I could use for inspiration or framework, I'd love to check it out.

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