AWhile Eleanor is trapped in the elevator, Clara goes to see Frank, intent on killing him because he knows their secret. She is stopped, however, when she intercepts a phone call from Ella and realizes that Morag has led Darvell and Savilla to the hotel. Clara races back to the hotel but the three of them have already taken Ella away in the car. Ella realizes that both Darvell and Savilla are vampires just as Clara leaps on the car and pleads with Darvell to let Ella go. When Morag questions where they're taking Ella (because they've already driven past both the police station and the hospital), Savilla breaks her neck. Savilla goes looking for Clara, whom he has managed to knock off the car, while Darvell stays with Ella, complimenting her for taking only those who are ready to die but explaining that Clara cannot be allowed to live. Darvell then goes looking for Savilla and Clara. Darvell and Savilla manage to capture Clara, and Savilla sends Darvell to bring the sword for her beheading. After Clara reminds Darvell about the pearl, he swings the sword but decapitates Savilla instead. Realizing that they're both going to be hunted down in the future by the brotherhood, Darvell burns the car and Savilla's body. Later, Clara informs Ella that she's cutting her loose and then she and Darvell walk away together. In the final scene, Eleanor leads Frank to the island. The birds fly off, and the waterfalls turn red.
ANo. Byzantium is based on a 2008 young adult play, A Vampire Story, by English dramatist Moira Buffini. Buffini adapted the play for the film.
AFemale vampires are not allowed in the males-only vampire brotherhood. Nor are they allowed to make new vampires. Clara defied that tradition by stealing the secret from Captain Ruthven (Jonny Lee Miller) and then using it to turn Ella. Add to that the fact that Clara works as a whore, both she and Ella are seen as aberrations by the hierarchy.