This is probably one of the more engaging novels that Christie wrote, and it's also easy to see why someone attempted to turn it into a game (though the game feels a bit flat in comparison). There are a lot of moving parts the pay attention to, though it also feels often like you're precisely in the position of Hercule Poirot despite having more information than he does (coming from chapters titled 'Not Hastings Perspective'). You're trying to find the clues that maybe he overlooked, even though you obtain them at roughly the same time.

Overall, it's just a very enjoyable kind of detective romp. Engaging and interesting with a story that is, once you recognise what's happening, fairly simple and not convoluted at all. (That is, btw, something I enjoy in mysteries.)

The spoiler comes after this:

The story left me with one major question, which is: Is it easier to suggest to people with epilepsy that they've done things that they really didn't? Or that things happened that didn't? Because this is a major plot device that is used in the conclusion, and I'm wondering if it was based on reality/presumed reality or assumption.