For Zelda, a twenty-one-year-old Viking enthusiast who lives with her older brother, Gert, life is best lived with some basic rules: 1. A smile means "thank you for doing something small that I liked." 2. Fist bumps and dabs = respect. 3. Strange people are not appreciated in her home. 4. Tomatoes must go in the middle of the sandwich and not get the bread wet. 5. Sometimes the most important things don't fit on lists. But when Zelda finds out that...