Given the question: Build a movie plot around this: How are Septimus and the princess related? They are brother and sister
The answer is:
Tristan Thorn (Charlie Cox) is the son of Dunstan Thorn and a captive princess called Una. The couple met only one night and fell in love instantly. Unfortunately, when Tristan was born, she was not allowed to keep him and instead sent him to live with his father. She put in his basket a "Babylon candle" and a letter to Tristan explaining everything.The story then jumps forward eighteen years to Tristan as a young man, in love with the prettiest girl, Victoria (Sienna Miller) in a small English town (Wall Village). He is desperate to bring her a newly fallen star by her birthday as that is the only way she will agree to marry him. He uses the candle to fly to where the star landed, which is not in England but in a magical land called Stormhold. Tristan soon discovers that the star is not what he expected. The star is actually a beautiful, immortal and spirited woman named Yvaine (Claire Danes). Despite this, Tristan is determined to marry Victoria. Tristan uses a silver chain that his father obtained while trying to free the princess to take Yvaine to England, promising to use the last of the magic candle to take her back to the sky afterwards.However, Tristan is not the only one seeking the star. Yvaine is in terrible danger because the surviving sons of the King (Peter O'Toole) are looking for her because only the jewel that she wears can secure the throne for one of them. Septimus, one of the princes, later finds out that a star's heart grants immortality. Septimus wants to devour her heart so that he can rule the kingdom forever. Additionally, the three witches known as "The Lilim" Mormo, Empusa and the eldest and the most powerful, Lamia (Michelle Pfeiffer) want her because they can recover their beauty and eternal youth by devouring the star's heart.As Tristan sets out to protect Yvaine and bring her back to Victoria at the other side of the wall his journey brings incredible encounters with the pirate Captain Shakespeare (Robert de Niro) and a shady trader (Ricky Gervais) among others. Yvaine and...