The night in Haunts Hill House

Madden Batty was found dead on the doorstep of her home in September 2021.
The suspects in your case were all invited to spend the night in Haunts Hill House according to the instructions left behind by Madden Batty in the event of her death.
Her solicitor Murdo Munster was there to explain to everyone what was planned.
Fortunately someone recorded a video of him.
Take a look.

Then take a look at the video Madden Batty wanted played to everyone.