Street art's most famous anonymous figure gets a chronicle built around his biggest public stunt: the 2018 auction-house shredding of "Girl with Balloon" moments after it sold at Sotheby's for over a million dollars. The film uses that moment as a doorway into the wider story of how Banksy moved from illegal stencils on Bristol and London walls to a market phenomenon that museums and collectors now compete over. It traces the tension running through his career, an artist whose work depends on defacing property and dodging police, now selling for record prices to the same institutions his pieces mock. Archival footage of early guerrilla pieces sits alongside coverage of gallery shows, auction records, and the elaborate anonymity that has kept his identity unconfirmed for decades. Commentators from the art and street-art worlds weigh in on what happens to outlaw art once it becomes blue-chip investment. The shredding stunt, filmed from inside a frame he'd rigged years earlier, remains the film's clearest illustration of an artist trying to sabotage his own commodification in real time.