Sadly we will have to assume this was the conclusion of the series - but I see an open end and wish that Steig Larsson was still with us.
Though I had not read the final novel before seeing Hornet's Nest (as I had the previous films) I felt that it moved forward with determination and consistency. Would that we could all be as true to ourselves as these wonderful characters. And as victorious.
I would not advise seeing this film without having either seen or read the previous two films/novels. But as a continuum, thoroughly satisfying and engaging.