Atonement

IMDB

2007, 123 minutes

Set in England in the summer of 1935, 13 year old Briony Tallis sees her sister Cecilia strip off her clothes and plunge into the garden fountain of their country house.

Watching her is Robbie Turner, her childhood friend, who. By the end of the day the lives of all three will have changed forever. Robbie and Cecilia will have crossed a boundary they had not even imagined at its start, and will have become victims of the younger girls imagination.