Heroist
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In short, I read a bit, and I don't know why you're digging for evidence on the Fortress when you already killed the Mafia. The remaining options are: if the Mafia wants to avoid suspicion as much as possible, there was a tea party, and now it's Nobody Knows Who; if the Investigator didn't have time to visit, it's also Nobody Knows Who; or we choose which of the blocked players to eliminate.
Whatever