D&D Adventure - The Haunted House

The Manor was just there, in the pouring rain, we didn't have anywhere else to take shelter so it seemed like the only real option... however... when we got inside, the doors shut and the outside went dark. The house had moved to some sort of pocket dimension, there was no way out... Then the apparitions started.
     - Adventurers final diary entry

The Deldworth Manor is haunted by a number of ghosts, the primary of which being the family themselves, who all met a sudden end over just 3 days. Discover the source of their demise and a way back to the material plane... else end up a spirit like those others who wander the halls in travelers attire. 

This side adventure is intended for a party of 3 or 4 characters at level 5 OR 10 (Sections will specify which part to use per those levels).

Books referenced:

• Monster Manual
• Mordenkainen's Tome of Foes ('Mordenkainen Presents: Monsters of the Multiverse' works too but bare in mind the stat blocks are slightly different)
• Wild Beyond the Witchlight (Required for Marys Room only)
• Van Richtens Guide to Ravenloft (Required for Marys Room only)

Cover images from FromOldBooks
Maps created with Dungeon Draft
Using assets from Forgotten Adventures and 2-Minute Tabletop