Low-grade, derivative psycho-stalker nonsense, with one touch of ingenuity – it's set in an underground car park, a grim concrete space of a kind everybody knows and dislikes.
Here our heroine, Manhattan lawyer Rachel Nichols, is trapped by over-friendly security guard Wes Bentley. The catalogue of gore and indignity is standard-issue, and audience engagement isn't helped by the psycho's lack of coherent motivation, or the director's evident belief that practically anything is scary if it's accompanied by a loud enough noise.
Bafflingly and annoyingly, the one noise you don't hear, among all the smashed-up cars, is a car alarm, which could have shut down the plot a good 30 minutes earlier. Presumably such things haven't reached America yet.