Elsa is almost eight years old, and her grandmother will soon be seventy-eight. Some say that grandma is eccentric, others call her a “cheerful old lady,” and a third group thinks she’s simply lost her mind. But for Elsa, her grandmother is a real hero and her best friend. She always protects her granddaughter and understands her better than anyone.
When grandma dies, she leaves letters that Elsa has to deliver to the addressees. Carrying out this errand, the girl learns a lot about her grandmother’s extraordinary life, fights real evil, and finds true friends.