This was an interesting one because instead of beginning with a murder, it starts with a young woman thinking she had committed one, but not having any evidence or even a body. This piques Poirot's interest as well and he starts to look into this woman, her family, friends and living situation.

I've always had an issue placing any Christie book outside of the 1930-1950 period. However, the 1970s was very evident here and very informative. I was interested to learn that the pracrtise of young women subleting the remaining rooms in their rental apartments out to other young women sort of started then. 

Christie used the proliferation of drugs as a theme in this one, which was also very timely. I thought the mystery itself was good and typical Christie. However, I found the social observations a bit too much. I don't exactly read a cosy murder mystery for those so for the first time, actually skipped bits of the novel.