Simple and well acted, it has tension enough to knot the stomach.

The movie really just wants to entertain people.

Just intense enough to provide a much-needed diversion, just lightweight enough to make you forget about it soon after it’s over. It’s not exactly “good,” per se, but it does what it sets out to do in terms of putting us on edge, which makes it … successful?

A great movie, one of the best of this year. There was a bit of confusion at one point in the plot, but nothing serious.