I've been told that the transition between chapters 4 and 5 is difficult to understand. In short: Luisa leaves the Biella branch where I also worked, and goes to work at the headquarters in Milan. We essentially worked for the same company. However, I remain at the Biella branch. Obviously, on weekends, either she comes to the residence in Biella or I go visit her in Milan. Chapter 5 is her life in Milan, including her relationships with colleagues, her boss, and me. We weren't married yet.