The Mafia House

Twenty people kidnaped by a mysterious stranger, wake up in a beautiful mansion made for the purpose of one game...
Mafia
There are no doors, and the windows have 10,000 bolts of power, making it impossible to escape with out killing your self.
Each person has assigned roles to play in the game. One role that makes you look normal, and another that you keep to yourself that is usually bad or you don't want other people to know.
You are assigned to either the Mafia, cult, or townsfolk. There are two killers. The thing is...

Anyone can kill