In the room below mine, a body lies in the pinking bathwater, the open eyes staring up at me for too long.
-- Narrator (Chapter 1)

Importance: The quote foreshadows early in the novel that one of the people with whom Frances is living will die. The connotations of the quote and surrounding information suggest that Cara has died by suicide.

He stroked her hair, his head lowered over hers, and I marvelled at the love I thought I saw in that motion, a mutual giving and receiving I had never known.
-- Narrator (Chapter 2)

Importance: As Frances spies on Cara and Peter through the Judas hole, she believes that what she is seeing is mutual love. Her idea that the two love each other deeply is contradicted by the arguments Peter and Cara have when they are alone. Peter’s refusal to allow Cara to sexually stimulate him also suggests the relationship is not as it seems.

Cara...
-- Victor (Chapter 4)