When renowned orchestra conductor Thibaut is diagnosed with a life-threatening illness, a DNA test reveals a shocking truth: he was adopted and has a biological brother – a factory worker who plays trombone in a small-town marching band. Their unexpected reunion sets off a heartfelt journey, as Thibaut searches for a bone marrow donor and a deeper sense of belonging. Authentic, humorous, and deeply moving, Emmanuel Courcol’s drama explores the healing power of music and the unlikely bond between two brothers brought together by fate.