While all his friends were going home, the soldier "Bat" was forced to spend the holiday at the base. To fill the monotonous boredom that reigns around him, he steps on the underground communications network "Sias" (named after the mythical radio announcer) and chats with Otto Ice Cream, Big Mack, Nelson and Bobby Solo - soldiers and reservists who share his fate. But when the female voice of the season called "Moon" rises on the line, the gray situation takes on a whole new meaning.