As she looks past him, her eyes alight on a glass box hanging from the ceiling by a thin metal wire. Walking over, she finds a small silver flask inside.
-- Narrator (Chapter 6)

Importance: When Elin first arrives at Le Sommet, she notices glass boxes containing artifacts from the sanatorium, including a spittoon used by patients to reduce the spread of infection. This quote is important because Margot and Cecile later use glass boxes to display the fingers of their victims.

It makes sense now, her brother celebrating his engagement here. This place, like Isaac, is all about façades. Covering up what really lies beneath.
-- Narrator (Chapter 4)

Importance: When Elin first arrives at Le Sommet, she is convinced that Isaac is hiding something from their past from her. This quote is important because it speaks to the hidden secrets within both the characters and the setting.

How would it ever get better? Her grief for Sam...
-- Narrator (Chapter 13)