'When a magical wish on a Conch shell whisks Stefan and Megan away from their Welsh coastline beach to the Magic Islands, the children feel lost and are quite unsure of their new environment. They have become marooned. Stefan and Megan follow two witches, Mogul and Drot to Wish-What Castle. They meet Nester the Jester, his strange pet - a dragon named Vanhalen, Ambrosious, the Wizard of the magical Enchanted Forest, Eglador, their guide, the Aliens of the Heavens known as the Purple Wizards, Gorad the teacher, and the Valendor Elves.
Trouble strikes the island when the witches arrive and when the Purple Wizards become shipwrecked on the islands' coastal beach. The Magic Islands become overpowered by wicked magical powers and mischief which the children witness and they are asked to solve the islands problems, capture the wizards and return the islands to peace.