Lydia and the Mist Rider

When her big brother Thaddeus is mysteriously snatched by the Enchanter, 11-year-old Lydia embarks on a quest to rescue him in the Sea of Mist. She's taken under the wing of the crew aboard the Dolphin, a flying ship, and becomes the apprentice to Ambrosia, an astromagician. Ambrosia is on a mission to find other lost children, including her own son. Determined to unravel the mystery, Lydia has to master astromagic to face off against the Enchanter.