This is the second book of Philip Pullman's epic fantasy trilogy which began with The Golden Compass. Lyra and her daemon and a cast of characters both familiar and new enter into whole new worlds. The universe has broken wide, and Lyra's friend lies dead. Desperate for answers and set on revenge, Lyra bursts into a new world in pursuit of his killer. Instead, she finds Will Parry, just twelve years old and already a murderer himself. He's on a quest as fierce as Lyra's, and together they strike out into this sunlit otherworld. Lyra and Will, in a desperate flight for Will's life, are drawn closer to Will's father and closer to the Subtle Knife, a deadly, magical, ancient tool that cuts windows between worlds. Through it all, the pair are drawn deeper and deeper into a fierce battle that they may not survive. On a journey marked by danger, Will and Lyra forge ahead. But with every step and each new horror, they move closer to the greatest threat of all — and the shattering truth of their own destiny.