The generation gap is a big theme in this one, and it is interesting to see this view of the era. 

similar plot to ABC

Third Girl, among other things, was overwhelming forgettable. I'm writing this review only two days after completing the novel, and nothing besides the basics of the plot are particularly memorable. The characters are mediocre, and the story itself quickly became so convoluted that it's difficult to remember most aspects of it. However, the novel is still interesting to an extent, and I did appreciate that the final solution was a bit darker compared to other Christie reads. Overall, Third Girl is certainly not a bad novel, but it's certainly not one of Christie's best.