Create a rule titled “Investigation” with the text:

  A living villager (the investigator) may secretly inform the mayor that they are investigating another living villager (the watched) once during each day.

  A villager is “Out at Night” if it is night and one of the following is true of them:
  1. They are the Night Watchman
  2. They are a werewolf who has selected a new living villager as their target at some point during that night
  3. They are “on the streets” per the Night Watchman rule
  4. They are an Investigator (per this rule)

  During each day, the Mayor shall privately inform each Investigator if their Watched was “Out at Night” on the previous night. In addition, if the Watched was a werewolf attacked a villager during that night, the Mayor shall privately inform the Investigator that their watched is a werewolf.

  Due to the concentration involved in investigating, and because investigators are often forced to sneak around in dark alleys to perform their work, investigators become easy targets for werewolves. An Investigator who would otherwise have immunity from being killed by werewolves loses that immunity. Otherwise an investigator that does not have immunity from being killed by werewolves may be killed by being targeted for Murder by a single werewolf (instead of the normal 2 required).

If a single living villager is ever investigated by more than one villager at the same time, that villager realizes he is being followed. The Mayor shall privately inform the watched villager of the name of each villager investigating them

Edited to remove the needless random die-rolls, and to fix the werewolf targeting issue.