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"I know I'm human. And if you were all these Things, then you'd all just attack me now, so some of you are still human."
R.J. MacReady, The Thing

"Listen Jim, we've got to have codenames for them. D'you remember the nursery rhyme "Tinker, tailor, soldier, sailor"? ... All I want from you, Jim is one... one word. Just ONE codename. If you have to scrawl it on the front door of the Embassy in Prague or phone our resident hood and shout it in his ear before you go underground... if there's some kind of fumble and that's necessary... just give me that one word."

Our heroes are sent to a conference, retreat, or some other gathering with a group of colleagues they don't know personally. Only... one of these "colleagues" is not what they seem.

Our heroes soon learn that one of their party has been replaced by some manner of villain (typically The Mole, though a random escaped criminal is not unheard of), but, for various contrived reasons, that's all the information they're going to get. So it's up to them to work out which of their supposed colleagues is really The Mole before he can kill them all. And you can't trust anyone until you do.

Often results in everyone being Locked In A Room. This can be self-imposed, as our heroes can't chance The Mole reporting back to headquarters. Circumstances will always contrive to prevent our heroes from getting in touch with the outside world to find out who The Mole is.

Non-recurring characters are subject to being killed off one-by-one by The Mole. The heroes are sometimes exempt, as The Mole needs them to get out of the Locked Room.

In a well-done example, the audience will work out who The Mole is only seconds before the heroes do, though they'll typically be led to an incorrect guess from early on.

Strictly speaking, no one is above suspicion, even our heroes, and at least one member of the group will panic, accuse the heroes, and run off to a certain demise. Of course, the audience (usually) knows better.

However, there are some rules to guide you in making your short-list of suspects:
  • One person will seem to actively hinder the investigation. He'll drop the radio, breaking it just before a description of The Mole is broadcast. He'll have a panic attack at a critical moment endangering the group. He'll be suspiciously uninformed about whatever his job is supposed to be. This person is never The Mole. He's just an idiot. (See Hanlons Razor.)
  • One person knows his job well, but he's a little high-strung. He accuses a lot of people of being The Mole on shaky grounds. If it doesn't turn out that he's the Mole (which is a little too obvious, and therefore rare), odds are the real Mole's going to kill him.
  • One person is very competent and helpful. He'll even have some extra skills that are handy for just the room in which they are locked. He might even find clues as to The Mole's identity. At some point, he'll save the hero's life. He's The Mole, and he's really very good at it.

Common twists:

Uncommon twists:

Compare Spot The Imposter, Zombie Infectee, And Then There Were None, Witch Hunt, and Red Herring Mole.

Examples:

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