This is a serial killer/detective thriller that mixes the Saw time-running-out theme with the Kiss The Girls style detectives-closing-in. There have been so many serial killer films since Silence of the Lambs that original plot points are typically limited to finding more inventive ways to kill someone. That applies here: the main original point being the use of website hits to increase the rate of torture to the victims.
The murders themselves are violent but not as gory as some, e.g. the later Saw sequels. The acting and direction are solid; Diane Lane is an effective lead, while Joseph Cross is suitably 'normal' but still creepy as the killer. Most unusually, for a film featuring high-tech FBI analysis of internet crime, the technology and terminology used is realistic. As someone who works in IT, I'm always irritated by huge fonts and email that arrives by flying across the screen. The FBI geeks talk in IP addresses, DNS routing and backdoor trojans (don't panic non-geeks, this is all brief conversation!); most importantly from a reality point of view, the computers used are all PCs. There's nothing more unrealistic in a movie than all characters using Apple Macs. Overall, I had limited expectations from the film but actually enjoyed it. It's not a classic but perfectly watchable.
The Blu-ray transfer has little opportunity to shine, with most scenes shot at night or in dark interiors. There is some film grain evident particularly on faces, but with plenty of detail too. The sound is very good, from the footsteps moving around the soundstage in the opening scenes to hefty subwoofer use in some very realistic claps of thunder towards the end.