"Untraceable" is great suspense movie by Gregory Hoblit. His
Primal Fear, Fallen, Frequency were excellent.
The plot is cat-and-mouse chase by serial killer vs. FBI agents. FBI cyber crime specialist Jennifer Marsh, she attempts to track down a serial killer who displays his murders on the Internet.
In "Untraceable", you'll see some horrible scenes like
SAW series. I warn you. If you dislike sadistic violence scenes, I don't recommend it.
Diane Lane, she was one of my favorite actresses since
The Outsiders. And, even now.