A murder at the dinner table — and four guests who all have something to hide.
Every playthrough authors a fresh mystery: a new setting, a new victim, a new tangle of motives, and exactly one killer among the guests. Question them one by one, compare their stories against the evening's timeline, and watch for the detail that doesn't fit. The innocent will lie to protect their own small shames; the guilty will lie to survive.
When you're sure, make your accusation — you only get one.