This is the 2nd movie by this director & i see a pattern here where he is interested in dealing with people who had lost something very dear to them & the effects it has on their minds. Unfortunately this movie is not good at all, the idea of how the anti hero went mad because of his loss is a bit interesting but the rest of the plot is very generic, low budget movie. On top of that you get to see the way Russians are interacting with each other, this only adds more sorrow to the viewer.
Conclusion: If you want to see an average thriller you'll go through this, but if you came to watch a good movie go see the 1st movie by this director "Rejection" (2011) which is way more interesting. I have to say that it's always a shame to see a director who created a good movie make a really bad one after that (as with Ang Lee, who sometimes makes great movies & then there are the complete BS like "Life of Pi" which really makes me want to throw up)