IAM, Soprano, the Fonky Family, Jul, and a dozen other rappers, composers and producers recount the genesis and blossoming of the rap movement in Marseilles, a leading musical attitude for more than 30 years in the making now.

Rap ? Violent words, a social chronicle without complacency at a time of the politically correct and a wishywashy consensus. Twenty years after its first babblings in the popular quarters of New York, rap has imposed its presence beyond the borders. Je rap donc je suis (I Rap Therefore I Am) goes around five different towns where it meets rappers driven by the same motivation. In Paris and its suburbs, Marseille and its districts, Algiers, London or Berlin, rappers move, play, record, teach... And above all, they talk. Outside of any promotional context, the present-day heralds of French hip-hop, from La Rumeur to IAM, speak about the role of rap, the environment in which it was born, boredom, the feeling of belonging to a sacrificed generation, drugs in districts of towns, immigration, parents, political and social actors, the police, school, writing, money, the parallel economy, violence...

In Belzunce, in the heart of Marseille's rap scene, the Guest Clique is preparing its next concert. But one of their members, K.Rhyme le Roi, harassed by a man in a BMW, disappears. Sista Vertu, DJ Rebel and Cash find him and accompany him on his run.