Twelve-year-old Luca is often torn between her love for her autistic sister Ida (14) and her own needs. After moving to the countryside, she meets the neighbor girl Fabienne. She doesn't want to share her sister at any price. But when the two girls also get on well, she tries to get rid of Ida. When she finally succeeds and Ida runs home in a rage, Luca realizes that maybe she doesn't want to be without her after all.