His Dark Materials: 2 The Subtle Knife by Philip Pullman.
There are worlds beyond our own – the Compass will show the way.
This is the second novel in Philip Pullman’s epic His Dark Materials trilogy.
The Subtle Knife brings Lyra to an eerie city where she meets a mysterious boy – a murderer. Will’s fate is strangely linked to hers, and together they must find a powerful and secret object which people from many worlds would kill to possess.