Final answer:
Sheriff Robinson, Larry Hendricks, and Clarence Ewalt discovered crucial clues related to the Clutter family's murder in the master bedroom, which played a significant role in unravelling the mystery behind the crime.
Step-by-step explanation:
The characters Sheriff Robinson, Larry Hendricks, and Clarence Ewalt discovered clues related to the murder of the Clutter family in the master bedroom. In Truman Capote's novel 'In Cold Blood', the meticulous search of the Clutter's home led to various findings, though not as extraordinary as a hidden treasure or evidence of a secret society. Nonetheless, these clues were significant because they helped piece together the events and motives surrounding the tragic incident that led to the family's demise.