Tween witch Pippa Dracona prefers mathematics to magic, so the chance to attend an ordinary human school was supposed to be a dream come true. But the Dame Ivy Newton School for Gifted and Unusual Students has too many archaic and nonsensical rules. Pippa is about to fail her favourite subject and lose her place in the course. When she makes a spur-of-the-moment decision to let two human children into the realm of magic, she might have made her worst choice yet. Or, perhaps, her best.