The story the movie is based on is true and moving. The play that the movie adopted (not adapted, adopted, as in integrated with) might be good as well. Where the movie went off into the weeds for me was when the director decided to cut frequently and without any meaningful transition from the play (actors reading from old security service reports) to an eclectic assortment of TV clips from the era. The period clips have very little to do with the story. They neither complement the story nor does the sequencing of clips tell a story of its own. They're just filler, plain and simple. Big missed opportunity.
Review of Uppercase Print
