Manor of Malice

From publisher blurb:

Manor of Malice is a short, location based adventure for 5th Edition for a party of four 3rd-level characters. It is campaign agnostic and can be inserted into any campaign.

Your party will find themselves the new owner of an abandoned noble's estate, but not all is as it appears. Lurking within the walls of this stately home is a secret, a hidden shame that destroyed the previous owners and all who dwelt within. As the party uncovers the secrets that destroyed this once happy home they will have to fight off demons, devils and undead and thwart a full-blown demonic invasion along the way before they can rest easy in their new abode.