Sicily 1860. Laura, a young noblewoman who grew up in a convent, is given in marriage to the baron of Carini, Don Mariano La Grua, an overbearing and lustful man. The life of the young baroness seems destined for unhappiness until she meets Luca Corbara, who arrives in the country to find his origins.

In the cave of the Beati Paoli, Luca Corbara protests for his innocence, but is locked up in a cell from which he escapes successfully. He finds refuge at Santelia's house and, on the occasion of a dance, finally manages to hug Laura again. Hope is rekindled for the two lovers.