I saw this movie with no knowledge of what it is about. It starts off with a teenager on a bus trip who has a flat tire. While waiting for another bus, he talks to another guy and the two seem to become friends. They decide to rent a car to get where they are going. The rental car also mysteriously has a flat. The befriended guy gets out to change the tire. While he is doing so a truck is head towards them on the highway. The other team looks at the truck and just as it is about to pass them, the teen shoves the tirechanger in front of the truck. The truck hits the tirechanger and crashes. The teen first checks that the trucker is dead then goes back to the tirechanger to ensure he is dead too. He stirs and the teen finishes the job by smashing him in the face with a stone. I was watching this and asking, what?
We are next shown that is several years later and a series of grisly serial killings are being investigated by Angelina Jolie. One of the key suspects is Ethan Hawke, who claims to have seen the killer and is worried that he will be the next victim. Anglelina believes him using psychological reasoning.
The rest of the movie goes along with Hawke being used as bait for the killer, while Jolie gets a psychological portrait. The killer is one who kills similar looking loner guys and then assumes their identities. He repeats this each time he gets bored with the life he is leading.
I don't want to give away the rest of the story because just about anything would be a spoiler, except the director seemed to make you think everything was wrapped up about halfway through the movie. Realizing the the film still has close to an hour left the audience can figure out that this is just a ruse. After that the plot seems to go completely downhill and you can figure out what will happen.
Angelina does have on pretty steamy scene that maybe goes a little overboard for an R-rated movie.