4/5 - A lot of people compare this thriller to "Gone Girl," which I have not read. The main character of this book is a girl named Rachel, who takes the same train to and from work every day and begins to make up stories about a couple she always sees in their home as she's traveling. One day she witnesses something shocking and from there the tension builds and things get interesting. 
 I actually hated all the characters, minus a couple minor ones, but was still drawn in to the story enough to want to keep reading. The characters are all horrible people - cheaters, liars, emotionally abusive, physically abusive, and/or stalkers, which I guess makes for great drama but I found myself being thankful that I don't know people like that in real life! I really didn't feel that much sympathy for the characters as things got worse and worse (with an exception that I won't share since it's a spoiler, even then I didn't like the character but acknowledge that she got more than she deserved). Hawkins knows how to write a page turner and she seamlessly split up the different point of view chapters. Each day of the story has a "Morning" and "Evening" section that paces it quickly, that along with the different timelines makes it a book that's hard to put down. My main critique is that the ending is a cliche "I am the bad guy and here's my confession!" moment. I guess that's okay though, since I did need a break from the horrible people and was ready for a resolution. My rating is 4/5 because it's so easy to get lost in, but it's not a happy book by any means.