It's the filmed version of a play of the same title. It's about what might happen if Queen Elizabeth II dies and Charles becomes King a few years in the future. The royal family (Charles, Camilla, Harry, William, Kate, George, Charlotte) are characters, along with the Prime Minister (Evans, unless I'm unaware, he's fictional). It's also written like a Shakespearean play, so the language of it is great. It's still contemporary, and I would say it's easier to understand than a Shakespearean play (there's still turns of phrase that we use today), but it's more eloquent because of the iambic pentametre. In Shakesperean fashion, there are soliloquies and even a ghost who appears and speaks to a couple of the characters (Diana).
The story starts with the Queen's funeral and a subsequent audience between the King and the Prime Minister. The PM is asking for royal assent for a law that would control the freedom of the press, which the King opposes and refuses to sign. The tension between the PM and the King's views on the law, and whether the King should have to sign even if he disagrees, propels the rest of the plot.
Have any of you all watched this film?