

One major problem here is the core of the plot-maybe I'm just lacking some knowledge from the real world that I need to understand it, but the plot hinges on a political document that if found, is predicted (with little lack of certainty) to bring about a complete revolution/overthrow of England.

There are just too many characters, too many threads, and occasionally, too little explanation of characters and threads. One main flaw is that the story is too complicated for its own good-probably the result of trying to translate a novel to a two-hour film. It's a decent but flawed film that will probably be enjoyed most by hardcore Christie fans. A full-length film, I've seen it claimed that it was filmed after the ten episodes of the series, and IMDb lists the series as preceding this film, yet it's the story of how "Partners in Crime" protagonists Tommy and Tuppence meet up as adults and start their sleuthing career, and according to IMDb, at least, it aired a year or so before the series on BBC. The Secret Adversary serves as the beginning of the BBC series "Agatha Christie's Partners in Crime".
