Everyone, Go to Sleep
Mafia. Many are familiar with the card game. The group of people playing are each dealt a card. Which card means which part can vary, but it's typically: Joker=Mafia, Queen of Hearts=Doctor, Jack of Spades=Sheriff. Everyone else is a peasant. The narrator of the game dictates when all players shut their eyes, and when the mafia, doctor, and sheriff open theirs. The mafia silently chooses someone to kill, the doctor chooses someone to save, and the sheriff chooses someone to accuse of being the mafia. When the narrator tells the group to wake up, they announce who has been killed, whether or not the doctor saved them, and who the sheriff accused. The townspeople all vote on the accused, deciding whether or not to hang them.
Katie and six of her friends were taking a hike in the woods when they came upon an abandoned barn. They went inside for a rest. After about half an hour, three more explorers entered the barn and greeted them.
"I'm Mike, this is Sylvia, and that's Kyle," said one of them, a tall, attractive brunet.
Katie and her friends talked and flirted for a few minutes when the previously silent Kyle spoke up.
"Let's play Mafia. I have cards."
Mike chimed in. "I'll be the narrator."
Unfortunately for Katie and her friends, Mike plays by a different set of rules. When the unknown mafia points at Sylvia to kill her and the doctor doesn't save her, Mike pulls out a pistol and shoots Sylvia in the head. It's his game now. Katie's only hope is to find out who the mafia is and have them hung (in Mike's game, quite literally) before she and her friends are all killed.