The Nordic countries seem to specialise in excellent crime suspense detective stories. Are there any that are not awesome? Dominic Monaghan, I accept is a Brit and his character is great: disturbed, utterly motivated and pleasantly unfriendly to his colleague (none of the Hollywood style hate gives way to love trite rubbish). The story is of the pursuit of a serial killer which becomes the pursuit of serial killers. Novel plot, stunning acting and totally compelling.
The playing of the film is marred by the mixture of Swedish and English, with subtitles only available for the Swedish dialogue. It would have been much better if there were also subtitles when the characters spoke English.
This is basically a good murder thriller that has the talents of the recent Scandinavian thrillers to thank for its well thought out and inventive plot, however it suffers somewhat from a great deal of unexplained and often irrelevant sideshoots to the plot along with a certain amount of extended scenes of personal angst which the characters are going through. It looks like it has been Americanised for US tastes and this detracts from the Scandinavian talent for a well focussed screenplay.
It doesn't ruin the series but it does feel like two distinct styles have been welded together and you can see the join.