Paris, 1830. Fleur de Marie is rescued from poverty by the mysterious Rodolphe, who is in fact the Grand Duke of Gérolstein, who has gone incognito in search of an illegitimate child he once had. Which is not at all to the taste of Sarah Mac Gregor, her current mistress who kidnaps Fleur and has her locked up in Saint-Lazare prison.
Four young friends share the carefree, cheerfulness, laughter and dances of Bohemian life. Rodolphe the painter, Alexandre Chaunard the composer, Colline the philosopher, as well as Marcel and his friend Musette. Mimi, a romantic young girl, falls in love with Rodolphe.
The tailors Moïse and Salomon Lévy decide to marry Mina, Salomon's daughter to a good match, to save themselves from the competition that Cohen makes for them. Mina will eventually succeed in marrying Pierre, from a marriage of love, without this harming the family business.
