I'd like to make a disclaimer that I remember very little about this book or when I read it (I think I read it sometime in the late 90's or early 2000's), so it'll probably be difficult to figure out what it is, but it's bothered me on occasion for a few years.
I want to say that it's from the 90's, but it could be later or much earlier than that. I really only remember bits and pieces of it, primarily the beginning. It starts out in the woods, where someone is running away from/stumbles upon a cult ritual. The cult members are wearing red cloaks, and I think that they catch the person and kill them. The main part of the book starts with a kid moving in to his uncle's(?) house.
Aside from this I really can't remember much, but I think at one point the kid navigates a maze that has a lot of trials along the way, and I think a mountain plays a significant role, but I could be completely wrong.
I believe the book was part of a series. If so, in one of the subsequent books there are alien spacecraft.
I think the cover was black and white with a drawing/print of a house on it.
I've also asked this question on r/whatsthatbook to no avail, so I figured I'd make an account and ask here since you guys seem to be pretty good at figuring this stuff out.
The most important aspect of the story is the beginning that I mentioned earlier. It's the one part that I know happened for sure, and the main reason I'm trying to find it.