Oy. I almost wish I had peeked, so I knew what was coming. Suffice it to say that it did NOT end well, and I don't just mean that they broke up. I finished the book late at night, reading by booklight. Freaked me right the hell out.
I won't say any more, just in case the three of you who read this regularly want to read it for yourselves. ;-) It really was a good book, though.