The 24-year-old actress stars alongside Ethan Hawke in the upcoming thriller, and it could be her most risqué role to date.
The film, which is currently being previewed in the US, is set for release in the UK in August 2015.
However, according to The Sun, one reviewer has already question Emma's sexy scene, describing it as "useless and ineffective".
They added: "You can see her breasts but they are partially obscured
he movie, which is being directed by Alejandro Amenábar, is set in a small Minnesota town in 1990.
Detective Bruce Kenner (played by Ethan) investigates the case of young Angela (played by Emma), who accuses her father, John Gray (played by David Dencik), of an unspeakable crime.
When John unexpectedly and without recollection admits guilt, psychologist Dr. Raines (played by David Thewlis) is brought in to help him relive his memories and they unmask a horrifying nationwide mystery.
Dale Dickey, Lothaire Bluteau and Devon Bostick also star in the upcoming film.