The Amber Spyglass (His Dark Materials #3)

Throughout the worlds, the forces of both heaven and hell are mustering to take part in Lord Asriel's audacious rebellion. Each player in this epic drama has a role to play--and a sacrifice to make. Witches, angels, spies, assassins, tempters, and pretenders--no one will remain unscathed.

Lyra and Will have the most dangerous task of all. They must journey to a gray-lit world where no living soul has ever gone and from which there is no escape.

As war rages and Dust drains from the sky, the fate of the living--and the dead--comes to depend on Lyra and Will. On the choices they make in love, and for love, forevermore.