Princess Lyra is a siren, the daughter of the queen of the sea, and the most dangerous of all underwater inhabitants. From early childhood, Lyra has been hunting princes - luring them with song, sinking ships and tearing out hearts. Siren is fearless and willful. But when she breaks the ban, her ruthless mother turns her into a mortal girl. Now, in order to return home, she must bring the heart of the famous Siren killer - Prince Elian - or remain forever in a human body.

Prince Elian is the heir to the throne of a powerful kingdom and captain of the famous team of Siren hunters. When he saves a girl drowning at sea, she promises to help him destroy the siren race. But Elian still does not know that in her face death itself appeared to him...