The Violins of Saint-Jacques

3 flutes (2 double piccolo), 2 oboes and cor anglais, 2 clarinet and bass-clarinet, 2 bassoons and contra-bassoon, 4 horns, 4 trumpets, 3 trombones, 1 tuba, timpani, percussion, organ, 2 harps, strings
Stage Music: flute, clarinet, two horns, four trumpets, three violins, one double bass[13]

In the Prologue, set in the present day, a band of fishermen in the Caribbean casting their nets hear the sound of violins in the distance. The old fisherman tells the others of the legend of the submerged island which rises from the sea to the ghostly sounds of carnival violins on Shrove Tuesday, the day on which it was destroyed by a volcano. The fishermen row away.

The scene changes to the jungle on the island and the rest of the opera depicts events on that fateful day. Sosthène, son of the Count de Serindan, is recently returned from France, and expresses his joy to be back on the island and especially his passion to see again his cousin Berthe; she however still looks on him as a child. Sosthène's sister Josephine and the governor's son, Marcel Sciocca, who are having a secret love affair, meet. Sosthène is angry with his sister's choice of lover, while Berthe is torn by her own love for Josephine.

The second act is set during the carnival of Mardi Gras, at a ball given by the Count at his colonial villa. He and his wife are awaiting their guests. These include the fop Captain Joubert, two brothers, François and Gontran de Chambines (both drunk), and Governor Sciocca and his wife and son. The evening's entertainment is provided not only by a troupe of masked dancers, but also by the flashing volcano in the distance, which is saluted by the party. The gypsy woman Maman Zélie predicts disaster before the night is over. Josephine and Marcel are by now intending to leave the island together for Paris, and slip out from the party. However, Sosthène has found out that Marcel is married already; and he notes their absence, he persuades Berthe to leave the villa determined to find the lovers and stop them eloping.

The next scene is at the harbourside. Revellers sing for Maman Zélie to cast some spells. When Josephine and Marcel enter, their carefree mood has changed to regret but Marcel is impatient that they go ahead with their plan and he drags her away. Sosthène and Berthe arrive, she worrying about the danger from the volcano. Sosthène tells her to row out to a ship moored off shore in case the fleeing lovers are planning to head for there; meanwhile he will seek them by horse, and that way they can prevent Josephine from leaving the island. When he once more declares his love, Berthe begins to feel love awakening for the man she has so far spurned.

Sosthène has managed to get the elopers recaptured and the three of them return to the villa still alive with revelry. Marcel's existing marriage is revealed, and he is forbidden to see Josephine again. Sosthène consoles his sister, and the others hope that things will work out well. The volcano then erupts and everyone panics.

Berthe, who as planned had rowed out into the harbour to intercept the two runaways is now the only person alive, and in the final scene at dawn she remembers Saint-Jacques and laments all those she loved.