The Devil's Serenade

I was really liking this book at the start, some of the scares (particularly involving the basement) were great and felt original. However once the book passed about the 70% mark and things started being revealed, everything just got too unbelievable and weird to me. Like, in a horror story I can definitely believe a magical tree integrating into the basement, but you expect me to believe that a long lost relative that a character was told she'd never see again lived to middle age in the /same small town/ and no one knew? Too weird. (It also all sort of got really sexual and unfortunate, which I guess is a gothic thing?)