Sally Rooney likes to play with fire. She writes an impressive quantity of words about nothing ( what some would call "bird brain" talk) but manages to slip in those incredible insights about life and relationships that keep you wanting more and keep you reading just as you're just about to quit . I'm usually not very tolerant of insignificant chatter but I have to admit that I was hooked in this case. And she achieves that in a very classical structure with an intro, a development and a conclusion.