I just watched the movie Housebound, and while it wasn’t quite a full GU story, it was at least worth an Honorable Mention here.
For one thing, it all takes place in a house (like so many of my favorite GU examples), and that’s actually a main plot point, because the protagonist is under house arrest and cannot leave the grounds. And because it’s her childhood home she’s confined to, there’s the whole “return home” aspect – even though in this case it begins the tale rather than being an interlude in the middle.
Upon arriving, Kylie’s mother tells her the house is haunted, but Kylie dismisses this – until strange things begin happening. Kylie’s parole officer ends up being a companion, as he is an amateur ghost-hunter. There are two feints as to the identity of the adversary (and one of the initial suspects becomes essentially a companion, helping Kylie here and there). The main hauntings occur in the basement, which is of course underground (and in the walls of the house, which was rather creepy). In the end, there is no real ‘final confrontation’ with the adversary, but it still has many of the elements in the right places. Not to mention, a wonderfully original combination of horror and comedy.