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Hmm... I have a couple of setting ideas, but I won't use them myself because I'm not a GM by nature, or at least not a mafia-style one, so I'm sharing them for those who might need them.
1. A village and aliens, I imagined a comical mafia using various stereotypes (mostly Western).
2. An archaeological camp, here the sides were represented as "archaeologists," "locals who are against the excavations," and "a disturbed dark force."
3. A haunted house, possessions, and all that, exorcists/ghost hunters... you get the idea.
4. For those nostalgic for childhood, Transformers, old school XD
I hope this is useful to someone. I also came up with a couple of roles, but they are a bit rough.
1. Gravedigger - knows the status of dead players, ND - absent.
2. Slave (or something else) - has no right to vote/the vote is controlled by the owner, knows the owner (if there is one), ND - searches the crime scene and finds additional evidence.
Well, these are the ideas, basically ^^'''