1189. York, England. Hanna, eleven years old, wants two things: a spell for invisibility and the safe return of her brother and father. Then Richard I sets the country ablaze with talk of the infidel and waging a holy war in Palestine... It's a story about a Jewish girl, a Christian boy, a book of ancient Babylonian magic - and the disaster that unfolds when forces beyond their control are unleashed. Hanna is caught up in real events from a medieval past, which resonate powerfully with our 21st-century present.