But it wasn’t Geillis’ revelation of her pregnancy that had left Claire frozen. It was something else entirely—the sight of a mark on Geillis’ arm, similar to the one Claire had seen on Hermione and Dudley, Aunt Petunia and Uncle Vernon Dursley. In this time, it was the mark of sorcery, the mark of a magus. It was the small, unassuming scar of a smallpox vaccination that chilled Claire to the marrow of her bones.