I'd Know You Anywhere, by Laura Lippman. The main character talks like a narrator. Not the content--she's not giving exposition left and right--but the syntax. "'Not even Vonnie, difficult as she can be, would go against our wishes.'" Try saying that sentence out loud. You almost can't. You certainly can't say it and convince me you're not reading it.
I suppose if this is the worst thing about the book, it'll be all right. Let's find out, shall we?