Actually, it's more of a cautionary tale of bad marketing. The first teaser trailer suggested that the scary guy was the devil or something, not an assassain/terrorist. The second trailer showed a little more, and really made me sad. The story was still quite good, but not nearly as interesting as it would have been if it had been the story I thought it was. Did that make any sense? Anyway, it was a good movie nonetheless, and I really got wrapped up in the story.
The terror was well played, you could really feel the main character, Lisa's fear and grief at the decision she was being forced to make. And the way she behaves throughout the movie is the way you hope you will behave if you ever find yourself in such a situation. She was smart and resourceful, even to the very end.
Overall, a very interesting premise. As usual, I don't want to give anything away, but I will say that I will look much more carefully at the people who sit beside me on airplanes from now on, because you never really know who is sitting next to you. Of course, I don't know anything that would make me a target, but then, she didn't think she did either. I guess you never know.
Anyway, very actiony and interesting flick, definately a good way to spend an afternoon. A couple of very painful moments near the end. You'll never look at pens the same way again, I promise!