We’ve all done it—staring out the window of a train or bus, catching a three-second glimpse into someone else’s living room and wondering what their life is like. But for Rachel Watson, that idle curiosity isn't just a way to pass the time; it’s the only thing keeping her afloat.

Rachel ( Emily Blunt ) is a mess. She’s an alcoholic divorcee who spends her daily commute to Manhattan obsessing over a seemingly perfect couple, Megan ( Haley Bennett ) and Scott ( Luke Evans ), who live just two doors down from her ex-husband, Tom ( Justin Theroux ).

While some critics felt the movie felt a bit like an "overblown soap opera," most agree that Emily Blunt’s performance is nothing short of powerhouse. She portrays Rachel’s pain with such intensity that you can’t help but root for her, even when she's at her most self-destructive.

The "new" wife (Rebecca Ferguson) who is fiercely protective of her domestic bliss.

What makes this film so unsettling isn't just the mystery; it’s the unreliable narrator . Because of Rachel's frequent blackouts, we only see the world through her fractured, alcohol-soaked lens. Director Tate Taylor uses "drunk vision" cinematography to put us right in her shoes—confused, defensive, and desperate for the truth.

If you’re a fan of psychological thrillers like Gone Girl , this is a must-see. Just don’t expect a light ride—this train goes to some very dark places.

The film also dives deep into the lives of three very different women: The "drunk" who has lost everything.