Lyra is an orphan who lives in a parallel universe in which science, theology and magic are entwined. Her search for a kidnapped friend uncovers a sinister plot involving stolen children, and tus into a quest to understand a mysterious phenomenon called Dust. She is later joined on her jouey by Will, a boy who possesses a knife that can cut windows between worlds. As she leas the truth about her parents and her prophesied destiny, the two young people are caught up in a war against celestial powers that ranges across many worlds.