On Ella's 13th birthday, she receives a mysterious gift from her grandmother - a doll that has been passed down from generation to generation named Luca. It quickly becomes clear that Luca is no ordinary doll, she is alive, she talks, and she has a lot to say. The family decides to hide her, But Effi the neighbor already realizes that something unusual is happening. How will the Helioprios deal with all the mess that Luca is making in their lives? And will they be able to keep the big secret?