Stephen King: The Eyes of the Dragon.
it has never even been rumored to be made a film and i dont know why. with the popularity of GoT and LOTR this movie should be a fucking hot pick.
its about a prince who is framed by an evil wizard named Flagg (yes that Flagg) and is locked up in a tower for the rest of his life for a murder he didnt commit. he must formulate his escape or the kingdom will perish.