Latin origin, Panamanian on their mother's side and Peruvian on their father's, the two Castro-Balbi brothers were born and raised in Besançon, France. After learning music there (cello for Alexandre, violin for David), they became professional musicians and now make a living from their profession. After many years, they returned to Panama and Peru for two major concerts. Based in Besançon, where the family continues to live, the film tells the story of their return to their origins, the better to anchor themselves in the present and move forward.