Mélidore arrives on the hermit's island only to find him dead. He decides to assume the hermit's identity. Jule and Phrosine arrive to ask the hermit if he has seen the fugitive Mélidore. The "hermit" tells them that Mélidore has drowned. Phrosine is distraught but then she recognises Mélidore's voice. The two secretly make a plan to see each other again. Mélidore says he will light a beacon on the island every night which will guide Phrosine as she swims across the Straits of Messina to him.
