You do not need to reveal or investigate the entire search area!
Yes! You read that right. Every piece of evidence requires a certain number of clues to be found. Once your club finds those clues, the evidence is assembled, and all of you earn the rewards. Your club then moves on to the next piece of evidence.
Once you’ve found all three pieces of evidence, the criminal is caught and the case is solved! Sometimes, this means that your club is completing as few as half the total number of sectors within a search area.