An average to slightly above-average thriller with a noticeable lack of twists, predictable or otherwise, Untraceable is acceptable viewing for anyone who is a fan of Diane Lane or dense enough about the Internet to buy the film's premise, that a hacker of limited means and intelligence could create and maintain a high-profile Website; the origin of which is untraceable by the FBI. It's a conceit that sounds fishy even to the computer know-nothings in the theater and at one point the film acknowledges this, throwing in the caveat that while the technology to trace the killer does exist, it's only available to the National Security Agency, and they aren't willing to share their technology with the FBI. Uh-huh. Let's assume, for the sake of argument, that that's the case. Once FBI agents themselves start getting murdered and their bodies grotesquely displayed on the site in question, wouldn't some responsible FBI chief threaten the NSA with a press conference to let America know that this culprit could be caught if the NSA spooks would only share their toys?
After they're stalked and selected, the killer's victims meet the sharp end of a taser and end up trapped in a Saw-like contraption in a dank basement, staring into a video camera that's sending feed to a website called KillWithMe.com -- yes, Sony has grabbed that particular domain and you should go there now to see some funny marketing. The killing mechanisms, be it a drip of acid into a water tank or the turning on of heat lamps one after the other, are incrementally activated by the number of hits the Website receives. The more people tune in, the faster the victim dies. Much like in Seven, the killer chooses high-profile, prominent victims to draw attention to his crimes and that only adds to the outlandishness of him being uncatchable. Still, there's enough lack of knowledge about the technology in question to make it sound something less than absurd, and the movie works on a the level of a cheap, quick ride that you can ride just long enough before it gets tiresome and irritating.