His Dark Materials: The Subtle Knife (Book 2)

In this sequel, Lyra and her friend Will enter the mysterious city of Cittagazze, where children thrive in the absence of adults. Their quest to locate Will's father is fraught with challenges, leading them to discover the Subtle Knife, a powerful artifact that opens portals between worlds. As they navigate this perilous journey, they become embroiled in a monumental conflict that unites various beings—mortals, witches, and spirits—against a formidable enemy. The story deepens the intrigue and sets the stage for the trilogy's conclusion.