Three Oxford students—John, Jack, and Charles—are thrust into an extraordinary adventure when they inherit a mysterious atlas, the Imaginarium Geographica. This magical book charts the hidden archipelago of mythic lands, from Avalon to Neverland, which they must protect from a terrifying enemy. Guided by a strange old man and a dragon, they discover they are the new Caretakers of this world, and their journey reveals shocking connections to famous authors and the power of stories themselves.