This has a lot of potential and unfortunately the film squanders it in favour of loud jump moments, many of them false, that often simply deflate any tension that was building. Apart from occasional moments, the film doesn't really make good use of the claustrophobic setting that it could have. That said, it is well made, there are a couple of creepy moments (a scene involving a mirror stands out), the underlying plot has a clever shift in perspective about 30 minutes into the film and the final act brings the threads together in a satisfying way. Well made and worth a watch, but nothing particularly stands out about it as a whole.