I was pleasantly surprised, as I had expected a rather mediocre action movie, but instead I was presented with a pretty good action-thriller. The film was very good at keeping you guessing as to the perpetrator's identity, and I found myself guessing quite a bit.
There were some silly scenes however, and the film was rife with "movie-science", but overall I was pleased. If you like Liam Neeson movies, then you'll like this, as the film is similar to his other films.
Overall, I'd give it a 7/10.
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[spoiler] [/spoiler]