Will bears the knife—an instrument of immense power and danger. Commanded by his dying father and accompanied by angels, his mission is clear: deliver this weapon to Lord Asriel.

But Lyra is missing. Without her, how can Will navigate the labyrinth of plots and intrigues that surround him? Only together can they hope to face the challenges ahead.

As the two great powers across the many worlds prepare for war, time is running out. Will's quest to find Lyra will lead them on an inevitable journey—even into the world of the dead.

Will they reunite in time to alter the fate of the worlds, or will darkness prevail?