Impatient to find the adventures of Bilbo Baggins? The universe created by Tolkien is populated with fantastic beings and terrible creatures. This documentary series reveals the sources of inspiration of the writer, who was also a professor of linguistics. In this episode, John Howe, illustrator and artistic director of the two trilogies of Peter Jackson, makes us discover the castles of the Rhine valley and the many legends attached to them, such as that of Siegfried, who may have inspired Tolkien in the elaboration of his work.