A spaceship is traveling through endless space and the crew is trying to survive. There is an impostor among them and the crew must be on their guard. They need to know the empty rooms and be ready to attack when they are alone with someone else or if that person is a fraud. The impostor wants to kill everyone and will sometimes sabotage the ship. He is cunning and sneaky. It can hide in dark corners and wait for its victim, or it can suddenly jump out of a vent and attack. It’s hard to find him among the crew unless he makes a mistake.