Lottie Fiske is an ordinary girl with an extraordinary problem: her best friend Eliot is dying of a mysterious illness. When a mysterious door appears in the roots of an apple tree, Lottie discovers a hidden world called Albion Isle, where she learns she might be a magical 'Greythorne' with the power to save her friend. Her journey becomes a thrilling adventure filled with magical creatures, secret societies, and dangerous foes who want to control the island's powerful magic. Lottie must navigate this strange new world, uncover family secrets, and find the cure before it's too late.