As Sofia, and her siblings Amber and James, prepare for their graduation from Royal Prep Academy, Sofia is called back to the Mystic Isles to face an evil witch named Vor, who is trying to take over the kingdom of Enchancia.
The arrival of the Queen Mum makes everyone question who will be the next king or queen; chaos ensues as Amber and James try to prove who will be the best.
When Amber discovers Sofia's role as storykeeper, she comes along on a mission to the Mystic Isles to help a former crystal being get her Terra Crystal back.