Archibald is a risk-averse boy with quirks that earn him plenty of eye-rolls, especially from his older sister, Hailee. Things get worse when his parents move the family from London to his grandmother’s creepy manor in the English countryside. Now he has to deal with hairless dolls in the library, weird stone creatures on the roof, and a spooky forest at the edge of the backyard. But these turn out to be the least of Archibald's problems . . .  One day, as he's exploring the cavernous house, he finds a curious globe that whisks him away to a secret world, hidden for 500 years. Archibald finds himself on a thrilling adventure full of medieval magic, mysterious symbols, and the strangest beasts, while Hailee—who witnessed her brother’s disappearance—embarks on a daring quest to find him.