Lajos Mezei is an insignificant, average, middle-aged man. He works at the post office sorting letters using a machine. His life is but a series monotonous everyday events, but he has a passion that makes him different from his fellow humans. This passion replaces all human relationships and events in his life - he flees into a world of his own, hermetically sealed, which only he can understand and where he therefore feels safe. One day, however, his well-balanced life is turned upside down.