Andrew was talking with the lifeguard. ‘I’m sorry my wife put you all through this. She has an overactive imagination.’ He smiled and made little circles by his head.
-- Andrew (Part 1, Chapter 1)

Importance: After Andrew upsets Lindsey so badly by disappearing with Sophie and making Lindsey believe that Sophie had drowned, he makes matters worse by the way he talks to the lifeguard about Lindsey. Andrew indicates that Lindsey has an overactive imagination and had no factual reason to believe that Sophie had been hurt.

But he hadn’t just wanted me to be scared. He wanted me to know he could take her from me. In the blink of an eye. One day I might be in the bathroom, or maybe I’d step outside for a moment, or go to the store, and they’d be gone. I would never see her again.
-- Narrator (Part 1, Chapter 1)

Importance: Lindsey knew that Andrew’s act of taking...