Sofia meets her hero, the brave but silent knight Sir Bartleby, and helps him to accept his unique voice and woo her Aunt Tilly.

As Sofia, and 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. Presented with her biggest challenge yet, Sofia must figure out a way to defeat Vor and save her family and the people of Enchancia.