In this arc Brennan and Molly really hit their stride. Gurwara is one of my favourite antagonists ever, in part because he genuinely pushes Ali to change as a character, and the interpersonal dynamics between Ali, Patrick, Clevin, Max, Tara, and Lisa all start to really feel real. I know I'm invested in a book when I start getting angry at characters because they're saying stupid things and I want to jump into the book to take sides in an argument, or to yell at someone for not treating someone else properly.