“Atonement - who is trying to atone and for what? Maybe that long rejection letter that Briony receives is more important than it seems at first ...”
“Briony wrote the book "Atonement" to atone for her sin of lying. Her deception created a unhappy tragic ending to the lives of Cecilia and Robbie. She gave them a life together in the story to lighten her own heart!”
“I agree that the "sin" is that of lying. Briony's Briony like her happy ending for Cecilia and Robbie is a fiction [another word for a lie]. But is the Briony at the end a real person? Or is there someone else behind her who is using her to atone ...? In which case what is the sin?”