Although the script is a little unconvincing, i think that this is a great series, one of the best that I have seen. Constant suspense and chaos. Mystery and anticipation. Loved it to the end. This is a great show from the BBC would love to see more like it.
I can understand why some people have given this a 1 star review, but they fail to appreciate night sleeper for what it is. The script is not perfect, some scenes are not acted particularly well, but the plot is top notch and it is incredibly well shot. 5 stars