A spaceship and its crew are attempting to survive in the vastness of space. They must remain vigilant since there is an impostor among them. They must be aware of vacant rooms and be prepared for an attack if they are left alone with another person, especially if that other person is the impostor. The Impostor is hell-bent on killing everyone and will go to any length, including sabotaging the ship. He is astute and devious. He can wait for his target in dark corners, or he can leap out of a ventilation shaft and attack from behind. Unless he makes a mistake, it's impossible to spot him among the crew members. Would you, Impostor, do something like that?