THE SUBTLE KNIFE. “His Dark Materials“, Book 2

'What is he? A friend, or an enemy?' 'He is a murderer'. Will has just killed a man. He's on the run. His escape will take him far beyond his own world, to the eerie disquiet of a deserted city, and to a girl, Lyra. Her fate is strangely linked to his own, and together they must find the most powerful weapon in all the world.