I would totally love a Devil and the White City movie done right. That book was great, and read like a novel, but I also have an interest in the history and architecture of the World's Fair. Killers of the Flower Moon wasn't as well written, but the events made it seem more like a novel.
I enjoyed Dunkirk, but if I hadn't seen a the BBC mini-series on Dunkirk a few days before the movie, I'd have been lost. The BBC version was a more straightforward take that explained exactly what was going on. That said, it wasn't the best war, and considering the cast and the subject, was disappointing.