Arianna is nineteen, but she's still waiting to get her first period. As the summer begins, her parents decide to renew their acquaintance with their country house on Lake Bolsena, where Arianna lived until she was three, and has never been back. As the family settle in for the summer, long-repressed memories start to re-emerge, and Arianna decides to stay on after her parents return to the city.

DIRECTOR'S NOTES:
The inspiration for Arianna goes way back, to an unexpected trick played on a boy by his unconscious, when one day he dreams he's a woman, and after that he's plagued by a basic question he'd never even thought to ask: why are we given one identity and not another? That boy was me at the age of nine, and the recurring dreams in which I thought I was someone else accompanied the tail end of my childhood, the time when children start to ask questions about their earthly existence. The fallout from those dreams and the reemergence of the memories behind them are the emotional wellspring for this film.