The Chief summoned us all to the debriefing room about a code red, city-wide issue.
Visit the different places and talk to all the persons you rescue to unlock the last place.
Unlike normal walkthroughs, in Nice Game Hints you can select just the puzzle you want hints for. Here are listed the puzzles for "06. Don of the Dead" in The Darkside Detective. The guide you choose only contains information about that puzzle, reducing possible spoilers for other puzzles.