Evan Slead
October 05, 2016 at 12:00 PM EDT

The Girl on the Train, which brings Paula Hawkins’ best-selling psychological mystery to the big screen, follows the search for a missing woman, with only one eyewitness to offer a lead on her disappearance. But that witness, played by Emily Blunt, is anything but reliable.

“How cool to have your female heroine be a blackout drunk,” the Sicario actress tells EW.

Blunt plays Rachel Watson, an alcoholic who often can’t remember her actions once she’s sober. It’s a departure from her previous roles, including Meryl Streep’s magazine assistant in The Devil Wears Prada, the Baker’s Wife in Into the Woods, and the Queen of England in The Young Victoria. “This film above any of the others that I did I think represents women’s right to be bad and flawed and wrong,” Blunt says. “We wanted to show that in all its authenticity as opposed to a kind of glossy, trivialized portrayal of women pitted against each other in a sort of whodunnit thriller.”

Watch the complete EW interview with Blunt and her costar Haley Bennett above.

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