Florence in 1848. There is a strong political tension in the Grand Duchy of Tuscany. Giovanni, a young Neapolitan composer who has just arrived in the city, accidentally comes into contact with some liberals and is convinced to compose the hymn of the Volunteers.
In 1830 Pierre Courier, a rich and elderly shipowner, awaits the return of his son Stefano, who has just returned from a long trip to Trinidad in the ship in which he is captain.
