Whenever a movie adaptation is released, we can't help but think back to the source material. The Girl on the Train was the must-read thriller of 2015, and for the most part, the movie sticks to the book. However, there are at least five big differences that you'll notice — even if it's been months since you read the book. If you're planning on seeing the movie, stop reading after the third point. If you don't care about spoilers, read on!
Spoilers below!