When Celine goes traipsing across a Parisian park, unwittingly dropping first a scarf, then other objects, Julie starts to follow her, picking up each item. So begins a fanciful relationship between the two, which soon sees each of them playfully switching identities in their daily lives.
Celine is a magician and mythomaniac. Julie is a librarian lost in her memories of childhood. They meet by chance, strike up a friendship, confide in each other, and, fleeing reality, move to an old, calm house where they start imagining a whole other incredible existence full of adventures. They each get caught up in their own game, and, willingly slipping away from reality, invent fantasies nourished by dreams, memories and desires. Their love of life, fantasy and adventure spurs them to set sail.