I guess I now have an inkling of how people that disliked Gone Girl felt. Maybe there was too much buildup to this book - which is where the similarities to Gone Girl end, in my opinion. It's a mystery, but not strikingly unique in the way I think Gone Girl was with Flynn's use of the narrator's perspective. Basically, Girl on the Train is about a very sad and troubled character who was drunk and can't remember a crime. We wait MANY PAGES for her to work through her memories and continued drinking. Once she finally remembers, the mystery is revealed! What a crappy and totally un-creative way to string a reader along! It did move fast, and I was somewhat surprised by the ending - but mostly because I thought it would be more of a twist and it was not.