The Goodreads blurb:
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?
It took me a while to get used to all the jumping around of viewpoints and even name changes, as we learn “Jess'” real name. But once I finally got the ladies all straight, I started really getting into the story. I rooted for Rachel as she struggled with her sobriety, I detested Anna, and I outloud gasped when I figured out whodunnit.
Goodreads likened it to Gone Girl, but I wouldn’t go quite that far. It’s not as dark, and maybe not quite as intense. But it was a fun and quick read that I would (and have!) recommend, and I’d rate it 3/5.