The investigator finds a large batch of defective shoes on the trade base and starts a case on this matter. Suddenly his son disappears. Soon the bell rang. The kidnappers demand that he close the case if he wants to see his son alive ... The hero tells this to his friends, two operatives and a journalist. They are friends from an orphanage and are ready to go for everything for the sake of a friend. Four fearless men challenge the mafia.