Plot
The girl on the train a psycological thriller by Paula Hawkins focuses on Rachel who at the start described as a depressed, drunkard, lost women not able to get over her ex-husband Tom but things change when Megan Hipwell, a lady whom Rachel observes from the train, goes missing.
Characters
The story is written in perspective of 3 women - Rachel, Megan, Anna
All 3 are quite different form one another
All characters are well rounded and plays a vital role making the story interesting.
Conclusion
Only thing is it's slow at start but
It's a good read if you want that interest and excitement of what's going to happen next built in at end of every chapter.