Thanks, I'll check it out, it sounds interesting.
I meant something non-paranormal, though, where even though there might be something supernatural, it turns out to be explainable at the end. The perfect example is not a YA book but the old movie VERTIGO. It spends a lot of time building suspense and making the viewers wonder whether supernatural stuff exists--and then it slams us with the truth in a twist.
Since I'm here again, I'd like some different recs on a subject that's hard to pin down. Examples: RENEGADE, THE VANISHING GAME, the MARA DYER series. Core: layers of reality and mind shifts. Not always literally. But perception gets skewed, the owls are not what they seem, memory is faulty, and MC isn't sure what's true and what's not, or even whether or not she is sane enough to trust herself.