Paula Hawkins' novel "The Girl On The Train" was the most talked about book of 2015, and now, the movie trailer for the film adaption is finally here — and it doesn't disapoint.

Related: How a morning commute inspired 'The Girl On The Train'

In case you haven't read the book, the emotional thriller is about a woman named Rachel who sees the same couple on her commute to and from work each day and builds up a story in her mind about them — and things take a deadly turn. To complicate things, Rachel is an alcoholic, so she can't always trust her memory and sometimes experiences blackouts.

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Emily Blunt will play Rachel in the movie and Justin Theroux, Allison Janney and Luke Evans also star. It doesn't hit theaters until October 7, but you can get your first look below. Then, click here to read our full interview with author Paula Hawkins.