Gerbert, by the window, shuddered; his mouth contorted. The witch began to twist faster and faster while her twin was talking to Gisela, mumbling to her, marching old holy words straight through the child’s ear into her skull, where they entered the bloodstream and looked for the enemy. The monk’s fingers twitched in the same rhythm and he found himself falling into a trance. He knew it would be dangerous to witness the witches brewing and dancing but there was an energy in it that he’d missed badly since he’d been asked to educate the young princess. Gerbert didn’t even notice when the hags stopped, tucked the girl in, rubbed the concoction on her lips and left for the unseen place from which they had come. Gisela healed quickly thereafter: The fever fell that same night and she asked for solid food the next morning. She had no memory of what had happened, but when she bounced on one leg across the meadow in the castle yard, she chanted a little melody that had not been heard in church, an odd melody that made Gerbert’s ears prick up because he sensed the uncanny in it.