A troubled divorced woman becomes thrust into a deadly mystery in the first trailer for Universal Pictures' The Girl on the Train. Emily Blunt leads an all-star cast as the divorcee Rachel, who sees something while riding on a train that turns her life upside down. In addition, Universal Pictures has also released a new poster and photos for this thriller, which hits theaters October 7.

In the thriller, Rachel (Emily Blunt), who is devastated by her recent divorce, spends her daily commute fantasizing about the seemingly perfect couple who live in a house that her train passes every day, until one morning she sees something shocking happen there and becomes entangled in the mystery that unfolds. Emily Blunt stars alongside Rebecca Ferguson, Haley Bennett, Justin Theroux, Luke Evans, Allison Janney, Edgar Ramirez, Lisa Kudrow and Laura Prepon. This thriller will go up against Fox Searchlight's Sundance sensation The Birth of a Nation and Lionsgate's Middle School: The Worst Years of My Life.

RELATED: Girl on the Train Beats Birth of a Nation at the Box Office with $24.6M

Tate Taylor (The Help, Get On Up) directs from an adapted script he co-wrote with Erin Cressida Wilson, based on Paula Hawkins' bestselling novel. Producer Marc Platt (Bridge of Spies, Into the Woods) acquired the rights to this novel back in March 2014, several months before the book debuted in January 2015, when it became a publishing sensation. By August 2015, the book had sold more than 3 million copies in the United States alone.

The Girl on the Train is the first novel Paula Hawkins published under her own name, although she had written four romantic comedy novels under the name Amy Silver since 2009. It only took her six months to write The Girl on the Train, a pace which was matched by the movie's development. Tate Taylor signed on to direct in May 2015, with the cast coming together swiftly in just a few months, before production began in New York City this past October. Jared LeBoff and Celia Costas serve as executive producers of this adaptation.

In addition to the trailer, we also have the first poster and new photos from The Girl on the Train, which you can check out below. This thriller could be one of this fall's big blockbusters, and a potential early candidate for awards season accolades, but we'll have to wait and see how fans and critics alike respond to this adaptation. Until then, check out the first trailer and poster for The Girl on the Train.

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