I spent the first part of this film umming and ahing as to whether or not I was enjoying it, but towards the end I was totally gripped and at the end I absolutely loved it.
The story and pacing of this film are practically perfect, making it a definite winner in my book, but any prospective viewers might benefit from being aware of a couple of things before they decide to watch.
Firstly it looks kind of like a cheap made for TV movie. Some of the camera shots are creative and well thought out but the whole thing just oozes film-making on a budget, and some people might find that hard to get past.
The style reminded me of the remake they did of The Outer Limits in the 90s, rather than a film from 2014. Also, much like the aforementioned series the incidental music is horribly generic and uninspired (but thankfully used pretty sparsely.) The acting is mediocre from the three leads. Some people will find this grating, so prepare yourself. They won't be winning any Academy Awards anytime soon for their performances, trust me.
So why should you definitely watch this movie? Because despite the clunky dialogue and wooden acting the plot is entertaining, unfolds brilliantly and is executed just about as perfectly as a plot can be executed in a movie. It is a wonderfully self-contained story that builds to a satisfying denouement and keeps you guessing and totally gripped along the way.
If you go into this movie expecting every aspect to be amazing, you're probably going to be disappointed. Instead bear in mind the criticisms above and trust that despite these weaknesses it is an uncommonly enjoyable watch and well worth an hour and forty minutes of your time.