Fern the Green Fairy is one of the foundational fairies in the original Rainbow Magic series. The story revolves around the core theme of the early books: Jack Frost has stolen the seven magical wands or items belonging to the Rainbow Fairies, causing all color to drain from Fairyland and the human world. Rachel Walker and Kirsty Tate must help Fern retrieve her green magical item, which controls all the green colors in the world, from the vibrant green of grass to the deep green of leaves. The quest involves solving small riddles and outsmarting the clumsy goblins to restore the color and magic back to its rightful place, saving Fairyland through teamwork and persistence.