The Subtle Knife

*The Subtle Knife* is the second book in Philip Pullman's *His Dark Materials* trilogy. It follows Will, a boy from our world, who discovers a mysterious, powerful knife that can cut through any material, including the fabric between worlds. The knife offers access to parallel universes, making it a valuable and dangerous object. As Will learns to master it, he faces moral choices and encounters complex characters. The story explores themes of identity, power, and destiny, blending adventure and philosophical questions about reality and authority in a richly imagined multiverse.