What is life like for Marjolin and Cadine in Les Halles?

Marjolin and Cadine grow up together and form a close bond of friendship and love. The children roam Les Halles, discovering places to hide and manage to learn the ins and outs of the great market. Eventually, young Cadine discovers a taste for commerce and begins her life as a vendor at Les Halles. Soon, Cadine begins her own small flower business and begins earning money of her own.