His Dark Materials: The Subtle Knife (Book 2) - Pullman Philip

"HIS DARK MATERIALS IS NOW AN HBO ORIGINAL SERIES STARRING DAFNE KEEN, RUTH WILSON, ANDREW SCOTT, AND LIN-MANUEL MIRANDA!
The spellbinding sequel to The Golden Compass, the modern fantasy classic that Entertainment Weekly named an "All-Time Greatest Novel" and Newsweek hailed as a "Top 100 Book of All Time," continues the epic adventure, catapulting readers between worlds, and toward a devastating discovery.
Lost in a new world, Lyra finds Will--a boy on the run, a murderer--a worthy and welcome ally. For this is a world where soul-eating Specters stalk the streets and witches share the skies with troops of angels.
Each is searching--Lyra for the meaning of Dark Matter, Will for his missing father--but what they find instead is a deadly secret, a knife of untold power. And neither Lyra nor Will suspects how tightly their lives, their