It would be impossible to not talk about how sloppy the first twenty-five or so minutes are. The editing is done in such a way that we just BREEZE through plot points. Scenes need to breathe, for goodness sakes.
After that, this is really just average stuff. Blunt's performance is very fine and capable, but the movie really just moves her from station to station without letting anything special develop anywhere. Ian Hart gets a few deliciously evil scenes ... but nothing ever settles in. You end up just watching people do things and stuff happens, without any real investment or emotion. Too bad, too, because the general plot outline, about an individual victim of Stalin's Great Purge and the resulting prison sentence, is great material with which to work.