It's a taught thriller of a book. I wanted to read it because of all the hype, and for the most part I understand why The Girl on the Train became such a phenomenon this year. For me, the juxtaposition of viewpoints was the strong attribute of the story. It's what kept this book at a good pace, and actually helped to increase the intensity in the latter half of the book. If it wasn't for alternating views, I probably would have become overly frustrated with the main character after the first 100 pages. 
 The ending was slightly off for me, but in not disappointment. A great first book for this author.