In The Girl on the Train, Emily Blunt plays an alcoholic woman, struggling to deal with the heartbreak of her divorce and failed fertility treatment.
The woman she becomes obsessed with watching through the train window, Megan Hipwell (Haley Bennett), seems to have the perfect relationship, but she doesn’t want a baby at all.
Now, speaking at the world premiere in London’s Leicester Square, Blunt has used the movie as a means of addressing societal pressures on women to become mothers – and the divisions it creates amongst them as a result.
The 33-year-old said: “I think there is a huge societal pressure on women when it comes to motherhood, this sort of mummy cult that goes on.
“And I think it sort of makes women feel that they have to be a bit defensive about the choices that they make, whether they want to be a mother, whether they don’t, whether they want to breastfeed, whether they don’t.
“I could go on and on.”
She added: “In the domestic world, I think it’s when women can be a bit cruel about each other, more so than any other environment.
“And I think this film really captures that.”
Paula Hawkins’ The Girl on the Train, which has sold over three million copies in the US alone, weaves a tale of mystery, heartbreak, and murder.
Several fans have commented that Blunt is “too beautiful” to take on the role of the book’s unreliable narrator.
Hawkins herself even commented on Blunt’s looks at the Chiswick Book Festival recently, saying: “Everybody moans about, ‘Oh, she’s too beautiful to play Rachel’ and she is.
“But the thing about Rachel, you know the key part of her is her self-loathing and how bad she feels about herself. They’ve done their best, I mean to sort of make her look a bit shit, but you know…”
However she went on to add that Blunt’s performance is “extraordinary”, and that fans of the book should give her the benefit of the doubt.
Blunt’s husband, John Krasinski, who has already seen the movie in full, is in full agreement with Hawkins.
Speaking to Popsugar, he insisted that his wife’s new role is “the best she’s ever done”.
He said: “I can say genuinely for the first time, it's the only time since, as long as I've known her, that I ever forgot that it was her on screen. That's how good she is in this movie, which is very rare and very hard to do.
“She goes so full into the transformation of someone who's going through obviously a struggle in her life and a struggle with addiction, and it's just incredible.”
Krasinski added: “She's so good. She's always so good, but this is like a tour-de-force performance for me.”
The Girl on the Train will be released in UK cinemas on 5 October.