? It’s late thirties England and a little rich girl named Briony Tallis with an overlarge vocabulary and pretensions to literary greatness tells a big fat lie to the police and ruins the life of her sister’s love interest (James McAvoy) because, well, she’s got a crush on him too, and he’s just a working-class mope who’s gotten above his station, and the upper-crusties are like that, you know . . .