I don't remember reading any other Agatha Christie novels although I do like older literature. One of the reasons I like the older novels is they are more intellectual and allow you to use your imagination more than some of the more modern literature. Every now and then I pick up a more recently written mystery and too many of them are way too graphic. Needless to say, my chosen genre I read the most is classics.
I did have trouble getting into this book and at one point sort of guessed "who done it", then changed my mind as the various characters were either under suspicion or cleared. I also thought the plot was a bit implausible. Several inexperienced people suddenly working as spies? And two of them just for the adventure?
I would like to read Charlie Chan and Dorothy Sayers. I've downloaded Chan from this site but haven't looked for Dorothy yet.
So many books, so little time.