ability to cut through any material, even the fabric between worlds. Will and Lyra learn that Cittàgazze is haunted by soul-eating spectres, which prey on adolescents and adults but ignore children.

Will uses the knife to cut a window into Sir Charles's home where he overhears a conversation with Mrs Coulter. Lyra realises that Sir Charles is Lord Boreal, originally from her own world, and Will hears news of his father, who had disappeared after discovering a window between the worlds. Will and Lyra