Okay, so one of the greatest strengths of a thriller is normally a totally unexpected twist - but in this case the exact opposite is true.
The film starts out as a dark, claustrophobic thriller - the kind we used to get in the days of SE7EN and Silence of the Lambs, etc. However, the twist the movie delivers, and it's final conclusion, ultimately end up completely derailing this film and turning it into a train wreck of absurdity.
At the end you feel like you've watched two different movies, and in this case that's not a good thing.
There's also some really annoying plot/character issues which start to appear prior to the moment of the movie-derailing twist (looking back now these were warning signs of what was about to unfold).
For example, the daughter goes from being a frightened and confused teenage captive to being the solid rock/savior for the other victims within a matter of scenes, before finally ending the film in the role of avenging angel.
Then there's the confusing motivation of the antagonist - why does he need so many babies? Did he always plan to make babies with his victims? Why was he making babies with his victims anyway? Why would he let one infertile victim live and become so central to his plans when one of the key plot points involves driving home the fact that infertile women are surplus to his requirements, and are killed because of this?
At the end of the day this movie just didn't know what it wanted to be - a dark serial killer mystery with a touch of gritty realism, or an escapist thriller with a mega twist.
If it had just chosen one or other of these two paths it would have probably worked a lot better, but because it tried to do too much, the plot twist and final ending, which would have been great in an escapist thriller, actually end up completely sabotaging the film.
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