His Dark Materials Book 2: The Subtle Knife by Philip Pullman

The spellbinding sequel to The Golden Compass 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 loves, their destinies are bound together...until they are split apart. Publisher : Yearling (May 22, 2001) Language : English Paperback : 384 pages ISBN-10 : 044041833X ISBN-13 : 978-0440418337 Item Weight : 8.2 ounces Dimensions : 5.19 x 0.87 x 7.63 inches