SOFIA UNLOCKS A SECRET WORLD AND BECOMES STORYKEEPER OF MAGICAL BOOKS IN   SOFIA THE FIRST: THE SECRET LIBRARY   Available on Disney DVD June 7   Features TWO Special Appearances – Princess Merida (“Brave”) and Olaf (“Frozen”) – Plus a FREE Sofia Necklace Inside!   Sofia’s Aunt Tilly returns to give her a gift that will unlock a secret world and appoint Sofia storykeeper of magical books without endings in “Sofia the First: The Secret Library.” Follow along as Sofia pursues adventures that will finish the narratives, including rescuing Minimus’ brother from an evil prince and setting out on a mission to stop Miss Nettle from stealing all the…