Banksy’s work has reportedly been traded for millions. But he puts up his street art for free. Going up against the art establishments, critics, auction houses, gallery owners and authentication boards in a quest for the elusive meal ticket, two filmmakers unwittingly gatecrash the murky and protective world of Banksy. How to Sell a Banksy raises questions of ownership, authentication and the true value of art itself. Through all the chaos and incompetence comes a modern-day true story.