It gets going with a bang, and doesn't really let up till the end. Difficult subject matter, terrible characters, suspense and fear. It's good to see a film coming out of the UK that does something interesting for a change. And this one was certainly horrific.
At times the script suffered from clunky dialogue – there was a lousy deployment of exposition on the train at one point – and I personally think there was a bit too much swearing.
I guessed the twist at the end, but that didn't really stop me from enjoying it. 7/10
