Hi, I'm looking for the name of this movie. - a couple go on a holiday, but the guy is hiding something. They drive around and a car is following them and they get in a car chase while possibly being on the sand and they drive over a sand hill and crash into another car, then they all gather together and sit around talking, to find out they are all connected in some way but didn't know. or something. and there is fighting/arguments. thats all I can remember.