The Subtle Knife is the second volume in Philip Pullman's celebrated fantasy trilogy, His Dark Materials. The story follows Lyra Belacqua as she crosses into another world—our world—and meets Will Parry, a boy escaping his own troubled life. Will is the bearer of the Subtle Knife, a dangerous, powerful object capable of cutting windows between different worlds. Lyra and Will must navigate a dangerous plot involving scientists, witches, and angels while being pursued by the sinister Magisterium. The book deepens the philosophical and scientific themes of the series, focusing on free will, original sin, and the vastness of the multiverse.
