Cleo (2019)

Orphaned young by their parents' car crash, little Tim and his teenage sister Cleo live with their Brussels grandmother. Encouraged by her music teacher, Cleo resumes her ambition as professional pianist, even gets selected to play a Rachmaninov piece at a public Christmas concert. At a club she meets and befriends insecure, supportive Leos, who lets his engagement get wrecked by dating her, but is actually tormented by a grim secret, surprisingly relevant to the kids.