In a story where progress meets creative invention, this film looks at how the blacksmith created items in wrought and cast iron that both served and embellished society. From the earliest ornate hinges and doors to magnificent baroque gates and mass-produced street furniture, it reveals the mastery of metalworkers such as Jean Tijou, Robert Bakewell and John Tresilian, the designs of Robert Adam and George Gilbert Scott, and the mass marketers of the Victorian age such as the Saracen foundry.