Caitlin was on cloud nine as she walked home from school, clutching her journal. She hadn’t been this happy in she didn’t know when.
-- Narrator (Chapter 4 paragraph 1)

Importance: On the way home from school, Caitlin is thrilled and happier than she has been in a very long time. Jonah has asked her out to a concert that very night at Carnegie Hall, and it makes Caitlin feel wanted. It is one of the few bright spots in her life.

But she now felt completely disoriented. And something else… Hunger. It wasn’t a normal hunger, but a deep, unquenchable thirst.
-- Narrator (Chapter 5 paragraph 42)

Importance: The night of the concert with Jonah, things escalate beyond Caitlin’s control. She is unable to keep her hunger in check, and it consumes her, leading her to feed on Sergei in his dressing room. This single act paves the way for the rest of the novel.

She could not let...
-- Narrator (Chapter 6 paragraph 53)