Rosalie has one big dream: to see the sea. How can she make it come true?

There's Dom and Margaux, the two sisters, and Rosalie, their 23-year-old aunt who's like an older sister to them, and Kevin. He's the one who'll enable them to fulfill their dream: for Rosalie has never seen the sea. And though she's always smiling all the time, her life hasn't been as easy as all that. Especially when people make fun of her for her Down Syndrome.
For Rosalie's birthday, Dom will show her the sea. A road trip begins, destination Brittany, in an old food truck. Things look dicey. But it was the best Dom and Margaux could do. What's next for them? Waves and surfing at La Torche?