ISBN : 0679879242
Accompanied by her daemon Pantalaimon (her other half, psychically linked to her and able to change into any animal form), Lyra Belacqua sets out to prevent her best friend and other kidnapped children from becoming the subject of gruesome experiments in the Far North. Talking armored bears and winged creatures live side by side with humans, and a mysterious entity called Dust just might have the power to unite the universes--if it isn't destroyed first. A complex, beautiful, multilayered epic story.
Sequels: The Subtle Knife, The Amber Spyglass