What is chapter 4 in pop by Gordon korman about?

Chapter 4 in "Pop" by Gordon Korman is about the protagonist, Marcus Jordan, dealing with his father's sudden disappearance and the challenges that come with it. As he struggles to cope with his emotions and navigate his new reality, Marcus begins to learn more about his father's past and the reasons behind his actions. The chapter sets the stage for Marcus's personal growth and the development of the story.