In the future, Earth is attacked by the planet Ebon. Now at war, a group of human soldiers travel to Ebon to fight the Ebonites but their rocket is shot down. Taken prisoner, they are sent to a work camp and soon learn that the Ebonites are capable of controlling the human senses. They are interrogated by the enemy that wants to know details of the next attack from Earth. The first to go is the mentally unstable private Arthur Dix, who was deprived of speech by the Ebonites but returns after the interrogation speaking again. One by one, the earthlings are interrogated by the Ebonites, increasing the mistrust between the men. Soon the interrogator discloses secret information, making the POWs suspect there is a traitor in their group. What is the secret of the Ebonites?
—Claudio Carvalho, Rio de Janeiro, Brazil