I read this book once when I was young and fell in love with it, but my mother took it away and I never saw it again. I can't find anything online no matter what I search. What I remember is:
the cover had a couple people on the bank of a lake in the distance, and the foreground was a hand sticking out of the water.
a girl goes to stay with family in Scotland, and in the room where she's sleeping, she gets woken up by the pictures hung above the bed glowing.
the male love interest has a Porsche, which she crashes trying to learn left handed driving
the guy's sister ends up being found floating face down in a fountain (or a pond, a body of water on the property)
there's a rock with a red stain on it, which I think was from a blood stained kiss from some other part in the storyline
parts of it were pretty creepy.
Please, please, if anybody has any idea which book this is, let me know. I've been searching for about five years now.