At once a high-level musician, member of the October Group, entertainer, theater artist, film actor, mountaineer, and skier, Maurice Baquet, always on the move, structured his life around two common threads: the cello and the mountains. He once defined himself as a "cellist-skier," "all alone" in this category, which prompted James Couttet, world ski champion, to say: "Of all the skiers I know, he's the best cellist." Echoing this, Professor at the Conservatoire National Supérieur, André Navarra, added: "Of all the cellists I know, he's the best skier." Throughout his varied yet coherent career, Baquet helped to project a joyful and artistic image of the mountains. Who better to talk about Maurice and all his adventures than his alter-ego: Cérébos, the faithful cello that never left his side? From Paris to Chamonix, from the stage to the granite slabs and snowy slopes, this film follows Cérébos, crossing the century and above all... smiling!