The film centers on Thibaut (Benjamin Lavernhe), a successful conductor living in the United States who occasionally returns to France for performances. During one such visit, he tells his sister Rose (Mathilde Courcol-Rozés) that he requires a bone-marrow transplant. When she turns out not to be a match, this triggers a series of events leading him to ask Jimmy (Pierre Lottin) – a brother he never knew existed and w…