I absolutely loved this book...until the end. 
 This one suffered from too much hype, especially the incessant comparisons to Gone Girl. It is not Gone Girl--Gone Girl had so many twists, and truly unexpected twists, that I doubt there's a single person that novel didn't surprise at least once. 
 The Girl on the Train, while well-written and with more likeable characters, can be seen coming from a mile away. I suspected the ending from almost the first chapter, and I was so disappointed when I was right--but I might not have felt that way if "The Twist" hadn't been so hyped and built up. So, if not for the ending, I would have given this a solid four stars. But in the end, it's really not that different from hundreds of mysteries I've read and watched.