Lucia’s brother Enrico is horrified to learn she has fallen in love with his sworn enemy Edgardo. He hastily arranges her marriage to his associate Arturo. Edgardo and Lucia privately exchange rings before he leaves to fight in France. Enrico tricks Lucia into believing that Edgardo has been unfaithful. Longing for death, she signs the contract with Arturo – moments before Edgardo returns. Lucia murders Arturo in their wedding bed. His death is followed first by Lucia’s, and then by Edgardo’s.