In the opinion of a Sotheby's expert, Eric Hebborn is the greatest art forger of all time. From his Italian retreat he has waged a 30-year war on the art market. He claims that his forgeries of great master drawings can be found in galleries across the world. Tonight's film shows Hebborn, now 57, at work. He talks about his work and career, and about the serious intention in his work to raise questions about the aesthetic value of art.