Four episodes from the children's animation following a little girl who becomes a princess. When her mother marries the king, Sofia becomes a member of the royal family overnight and moves into their grand palace. In this installment, after receiving a book of secrets from her Aunt Tilly, Sofia finds her destiny is to become the new Story Keeper of the castle's secret library. The episodes are: 'Princess Adventure Club', 'The Secret Library', 'The Princess Ballet', 'The Secret Library: Olaf and the Tale of Miss Nettle'.