I've read this before, but I was in the mood for something light and entertaining and couldn't remember exactly what happened. I have to say that there are some monumental, and extremely unlikely coincidences in this book. I found the obligatory mention of Cold War spying and defection unnecessary, except in a way to get the protagonist into the story, which could have been managed far more skilfully by someone as capable as Christie. I have to say that I found the solution, which only Poirot managed to figure out, elegant and well thought out. This isn't one of her best, but it's still a quick read that's fun and entertaining, without requiring too much thought.