Who is the narrator, can she or he read minds, and, more importantly, can we trust her or him?
Third-Person (Limited Omniscient)
We may say that the book is in the third-person, but don't be confused: It's still M.C.'s story all the way through.
This book is all about how M.C. thinks and feels, and it's limited to his perspective. Even descriptions of the scenery are from his perspective. Case in point, this description of the Killburn buildings on the Mound:
So that what happened right before M.C.'s eyes was that the enclosure of chocolate and silver sheds and barns took on the appearance of a fairyland. Carved out of dark soil and bold, blue sky, it looked unearthly all of a sudden, and slightly sinister. (11.151)
Are the Killburn houses really all that sinister? We'll never really know because all we can see is what M.C. sees and how he interprets things. But we can suspect that M.C. might be wrong, that the perspective is too limited. That's because we see M.C. struggling with his complicated feelings for the Killburns—on one hand they're witchy and creepy to him, while on the other hand Ben's his best friend.
So when, at the end of the book, M.C. stands up to his bigoted father and outs Ben as his best friend, we know M.C.'s changed his own perspective and thoughts about the Killburns to some degree.