Little Matti is lonely. He does not have any playmates, and due to the GDR′s policy he is not allowed to attend kindergarten, since his mother stays at home anyway to take care of the newborn twins. One day, Matti meets the charming Mr. Clasen. He takes the boy to his garage, which turns out to be a wonderful playground for Matti. When the little fellow detects a discarded fire engine on a junkyard, the wealthy Clasen buys the vehicle and fixes it with the help of his apprentices and the neighbor′s children. Eventually, the illustrious "fire brigade" is employed in a real operation.