Mystic River is a good choice for confident learners looking for more realistic and demanding listening practice. The vocabulary is not overly technical, though it includes enough variety to make the practice meaningful. With the dialogue moving at a natural rhythm, viewers should catch most of it, although a few moments may still be challenging. There is enough plot detail to keep learners engaged without making the whole experience confusing. The community has given Mystic River an English difficulty rating of 6.6/10, so a B2/C1 level is recommended to learn from it effectively and enjoy the content.