Fifty Shades Darker (Blu-ray release 2017-5-9) follows the romantic development of the protagonists, who are back together in no time after breaking up at the end of the previous movie.  Although the story should have been rich with several subplots and seemingly important characters, those subplots and characters are not developed in any depth at all, and are resolved quickly with zero consequence in this movie.  This problem reduces the overall dramatic impact.