The Girl on the Train by Paula Hawkins

Rachel takes the same commuter train every morning. Every day she rattles down the track, flashes past a stretch of cozy suburban homes, and stops at the signal that allows her to daily watch the same couple breakfasting on their deck. She’s even started to feel like she knows them. “Jess and Jason,” she calls them. Their life—as she sees it—is perfect. Not unlike the life she recently lost.

And then she sees something shocking. It’s only a minute until the train moves on, but it’s enough. Now everything’s changed. Unable to keep it to herself, Rachel offers what she knows to the police, and becomes inextricably entwined in what happens next, as well as in the lives of everyone involved. Has she done more harm than good?

A compulsively readable, emotionally immersive, Hitchcockian thriller that draws comparisons to Gone Girl, The Silent Wife, or Before I Go to Sleep, this is an electrifying debut embraced by readers across markets and categories. 

Its interesting what sort of assumptions we make about other peoples lives, just based on little pieces of information we see or overhear. This book is a perfect example of that, and how those assumptions can protects us, or get us in to trouble.

This story had a great pace, was easy to read and suspenseful, although I wasn't completely shocked by the ending. 

The characters were well written and they evolved really well once more of the detail came out.

A great read and one that wasn't easy to put down.