Small budget British film about a group of people trying to figure out why they are locked up in their flat. The answer to this will be painfully obvious from the outset and the film will unravel just as you will expect. However that doesn't mean it is terrible by any stretch of the imagination. In fact it is a pretty solid 'survivor group' film with all the regular character types you would expect from such, so if you are a fan of these types of films then you will definitely find something to enjoy.
For anyone else there will most likely be a problem with pacing as it does seem to drag a tad, especially since it takes awhile for the film to reveal to the characters what we as the audience have figured out from near the beginning. There are also a lot of clichés that will seem tired and obvious, as well as possibly lazy.
Despite this there is nothing glaringly bad about the film, which to its credit works very well within its budget and keeps everything nice and simple so that it works and doesn't seem cheap or unfinished. Overall it is a good study for those looking to make a similar type of film as it is a textbook case of a group of people dropped into an unfamiliar situation where they seek to survive. As such it doesn't reach any dizzying heights or provoke much original thought, but it is solid and certainly is worth a watch if you are a fan of this sort of film.