The group spend the night in Nockmaar Castle.
This is a good episode with some creepy visuals and decent character moments.
The plot has some good haunted house scenes that work fairly well with the self-referential humour of the show and the development of certain characters.
For an episode with a simple premise it feels slightly cluttered with ideas at times. I watched it with my young daughter who asked me a few times what was going on and there were a few aspects that felt confusing when I had to explain, such as what was behind the door and elements of Graydon's backstory.
Putting certain deviations in the plot aside, the central drama, involving Graydon and Elora, does unfold pretty well, although some aspects are quite predictable.
How much you enjoy largely depends on how interesting you find the characters. I like Willow because of the established history and Warwick Davis' charisma, but I am yet to warm to the new additions.
Visually it works very well, with the set design, cinematography, lighting, and horror effects all creating the appropriate atmosphere.