Briony is a teenage girl with a bright imagination and a neck for drama. Her gift is literature, and she uses real-life events and people around her as inspiration for her writing. But when she catches her older sis and her man making love in the library, she thinks that he's assaulting the girl. She's confident that what they are doing is wrong and forever changes the fates of all three of them. Soon, WW2 comes knocking at their door, and Robbie is forced to leave home to fight the enemy. The thing is - Briony has always had a crush on him. He grew up in the same house and was practically family, even though he had different parents. And as it soon turns out, it was her childish jealousy that made the girl accuse the man of raping not only her sister but also another local girl.