Dawn isn’t at her desk this morning when I walk into the office, which means the world is coming to an end.
-- Narrator - Natalie (Part 1: Chapter 1)

Importance: Natalie narrates that Dawn’s schedule is so precise that Natalie could set her watch by it. Therefore, when Dawn is late to work, Natalie assumes that something bad has happened to her.

But…’ He scratches his chin. ‘We weren’t together all night last night. I left around 9:30.
-- Caleb (Part 1: Chapter 7)

Importance: Natalie tells Caleb that she lied to Santoro and told him that she and Caleb were together all night. She asks him to support her and lie to Santoro as well. Caleb reminds her that they were not together all night. He says he does not feel right lying to the police, but agrees to do so.

Because,’ he says, ‘we found Dawn’s body early this morning.
-- Santoro (Part 1: Chapter 21)

Importance: When it appears that Santoro is blaming Natalie for what...