Yancy was eventually accused by Internal Review of making up lies about a fellow officer and of trying to extort money from Crime Stoppers.
-- Narrator (chapter 2)

Importance: The quote demonstrates Yancy’s willingness to bend the law to suit his whim.

Foolishly, Yancy dissected every marked passage in the hopes of finding clues to Bonnie’s innermost feelings.
-- Narrator (chapter 4)

Importance: The quote illustrates Yancy’s continued investment in his relationship with Bonnie. He knows the relationship is over, but he wants to know whether she still cares for him after he sacrificed his career to defend her honor.

Ever since meeting Eve Stripling, Yancy had been sleeping poorly, nagged by the missing pieces of her story – a story of no evident interest to anyone but him.
-- Narrator (chapter 5)

Importance: The quote demonstrates Yancy’s true nature as an investigator. He knows something is off with her story, but he does not know exactly what and is not sure...