The amber spyglass - Philip Pullman

Lyra lies sleeping in a cave near a rainbow, drugged into unconsciousness
by her mother,Mrs Coulter, whose love for her daughter closely
rivals her own ruthless ambition. Now, the latter threatens
to overcome the former, as she strives to prevent the events which
are dependent on the decisions Lyra is fated to make. Meanwhile,
Will-scarred and traumatised after his last, fatal meeting with
his father-seeks blindly for her, with only two of Lord Asriel's
angels as companions on his dangerous search. The two are fated
to meet once more, however, and begin their most treacherous journey.
For Lyra owes a great debt, and she must repay it-she must
rescue her friend from the Land of the Dead. Neither are prepard
for the terrible sacrifice they must endure, or for the universal
consequences of their actions. Lyra and Will must play their part
in the war between the worlds and Heaven...