What role does WITSEC play in the lives of the novel’s characters? Why do the members of Nick’s family respond differently to being in witness protection?

WITSEC forces people to abandon their previous lives. What effect has this requirement had on Nick? On Donna?

Why are Nick and his parents the novel’s only Black characters? If Giles is interested in writing about the lives of specifically Black teens, why does the novel not include any other Black students, administrators, teachers, or townsfolk?