Midnight Raid!

From the introduction: You are all horse addicts locked inside a drug dealer’s den. He suspects that one of you is an Undercover Agent. He’s right! Until you Burn the Agent, he won’t let you out or give you more horse. If things get too rowdy, he’ll just kill all of you. If you don’t find the agent before midnight, the cops will raid the den and the agent wins. The game starts at noon...