Synonym of gathering, sharing, discovery, freedom and big sound, or even political protest for some, synonym of insanity, delinquency, drugs and illegality for others, this film allows us to see with a more objective way, thanks to the comments from a crew and the police, the story of a french sound system, the "Heretik", which make move thousands of "ravers”. Their history, but that pretty much sums up all the other festivals of the genre, which try as best they could to keep their independence from the government ...