Found some info. on the movie on IMDB.com
Warning! This synopsis contains spoilers
A young man named Tristran (Charlie Cox) tries to win the heart of Victoria (Sienna Miller), the beautiful but cold object of his desire, by going on a quest to retrieve a fallen star. His journey takes him to a mysterious and forbidden land beyond the walls of his village. On his odyssey, Tristran finds the star, which has transformed into a striking girl named Yvaine (Claire Danes). However, Tristran is not the only one seeking the star. Lord Stormhold's (Peter O'Toole) three living sons not to mention the ghosts of their four dead brothers all need the star as they vie for the throne. Tristran must also overcome the evil witch, Lamia (Michelle Pfeiffer), who needs the star to make her young again. As Tristran battles to survive these threats, encountering a pirate named Captain Shakespeare (Robert De Niro) and a shady trader named Ferdy the Fence (Ricky Gervais) along the way, his quest changes. He must now win the heart of the star for himself as he discovers the meaning of true love.
