One summer, Dídac travels by bike along the Danube with his family, starting where the river first emerges in Germany. As they journey downstream, he begins seeing a mysterious boy, Alexander, who appears and disappears in the water. Dídac feels himself changing, drawn toward Alexander and away from his brother Biel. Their mother, Monika, who once took the same trip as a teenager, drifts into memories of a past summer love. When she sees Dídac and Alexander together, she encourages them to continue the journey alone. But as twilight falls, Dídac begins to question who Alexander truly is.

Wolfgang, a 9-year-old boy with an IQ of 125, is forced to live with his father, Carles, whom he has never seen, after the sudden death of his mother. He has one obsession, to run away to Paris to study at the Grimald Academy and become the best pianist in the world. But what Wolfgang doesn’t know is that the biggest challenge is right in front of him and that is to get along with his father.