The film received widespread critical acclaim, with many praising the performances of the cast, particularly Saoirse Ronan, who was nominated for an Academy Award for Best Supporting Actress.

Keira Knightley plays Cecilia Tallis, Briony's older sister, who is beautiful, independent, and strong-willed. Her character serves as a foil to Briony's, highlighting the complexities of their relationship and the societal expectations placed upon them.

The "deep" core of the film lies in its final act. Decades later, an elderly Briony reveals that the reunion we just witnessed between Cecilia and Robbie was a .