The person extended an arm toward the lieutenant. Bernie saw a gun. Heard the unmistakable crack of the shot. Saw Leaphorn stagger back, falling against his pickup. Crumple to the asphalt.”
-- Narrator (chapter 1)

Importance: The shooting of Leaphorn is what sets off the main plot of the book. Bernie witnessing it also makes her feel guilty for not doing more, which haunts her throughout the rest of the book.

I heard Lieutenant Leaphorn could look at evidence and read it to discover stuff no one else saw” he said. “I heard he could make a few phone calls to his contacts and shake things up. That he could take an investigation that had been stalled and move it forward.”
-- Chee (chapter 1)

Importance: This quote establishes the respect and admiration that the police department has for Leaphorn, as well as Chee. It helps to explain why they are all so invested in solving his shooting.

Her upbringing...
-- Bernie (chapter 2)