This was an enjoyable enough read but it certainly didn't 'forever change the way you look at other people’s lives' as promised in the bumf. I also wouldn't put it in the same category as Gone Girl and The Book of You, both of which I abandoned.
Although the narrative is provided by three women, Rachel, Anna and Megan, it is Rachel who is the main character. She is 'The Girl on the Train' of the title. Struggling with alcoholism, she can manage to go a few days without drinking but then binges and loses all sense of reality, forgetting important events and blacking out.
Rachel passes Anna and Megan's houses as she does her daily commute on the train into London. Anna lives in the house that was once Rachel's home and Megan lives a few doors down. While Rachel hates Anna, she dreams up the perfect life for Megan and her husband, naming them Jess and Jason.
Needless to say, everything is not as it seems and there are some great plot twists in this novel. Having said that, I'm not quite sure why this has received such hype, I was expecting something more involving and un-put-downable. I'm not a fan of psychological thrillers, so the fact that I finished it actually means it's not much of a thriller!