4.5 stars 
 What else can I say other than I LOVED this book. Throughout the entire thing I found myself thinking, "Ohhh! It's them! They did it, obviously! I can't believe I didn't see it before!" 
 Then I ended up wrong each time, and I've never been so happy to be wrong!! 
 Every character was so well-developed and I could empathise and understand all of them. Rachel's situation was heartbreaking to read and even though I hated Anna in the beginning, when we got more of her POV, I actually began to feel sorry for her. I can't LIKE her but I don't want to kill her anymore. 
 To prove how engrossing The Girl on the Train is, I am a terrible flier and I read this on the aeroplane to Portugal, and I was so wrapped up that I didn't have time to panic. I though twenty minutes had past, but we were already landing! 
 Wholly recommend it.