A festive journey into infancy

Twelve-year-old Alex is not at all thrilled with the idea of going to a children's birthday party with his little sister. He's sure he'll be bored and crowded with kids. But an accident - or something more - turns the party into an unexpected adventure.
Suddenly thrust into an unfamiliar role and a new reality, Alex is faced with questions for which he has no answers. How do you go back? And is it possible?