"Write it all down. Just the truth. No rhymes, no embellishments, no adjectives. "
This line, in a nutshell, is why Atonement is a good film.
The first time we hear it, it is spoken by Robbie, in the apartment with Cecelia, where Nursegirl Briony has found them. Briony has realized the extreme error of her ways and wishes to correct the wrong as best she can.
The last time we hear it, it is spoken by Elderly Briony...by the time you realize you have heard those exact words earlier in the film and who spoke them...you begin to reel toward the conclusion that Briony too soon divulges. And you know what she is going to say before she says it.