The performance by Rachel Nichols raises this well above many of its type. At no time does she do the helpless girl, or screaming useless woman part. A creepy thriller with only two main characters and almost no other cast. Sounds impossible to do but it pulls it off completely. This has the feel of a French film, though it is American. The US film industry rarely trusts the viewer, usually dealing out plot spoilers and warnings within a few minutes. This time, they have gone all European, letting the tension build and the plot take its course. The subterranean setting of the underground car park helps build the atmosphere, and adds to the claustrophobic feel of the film. Think 'Creep' without the dribbling monster. This is a situation that you can see yourself in, with no science fiction or unrealistic elements added, or necessary. For any fan of the slasher movie, psychological thriller, or victim against the odds plot, it is a must buy.