Harry Potter series, The Half-Blood Prince.
With Voldemort & his Dark-Eaters waging war on both the Wizarding and Muggle worlds, Harry learns more about the Dark Lord and how he came to be, as well as discovering disturbing evidence of how much the two are actually alike. While the previous films were a healthy balance of style and substance, this one leans more towards the striking visuals making it just too damned dark to be much fun. When it does have a bit of a laugh it breaks the tone and feels ridiculously out of place. Even the actors, apart from Alan Rickman and Jim Broadbent, don't seem to be up to par with their previous performances. Still, it is perhaps one of the most important chapters in the series, seeing as it's tragic ending leads to the explosive conclusion.
I like to consider this the calm before the storm.
3 bumpy bridges out of 5