The Subtle Knife is the second in the dark materials trilogy. Northern Lights follows with the addition of a new protagonist Will, who, at the same time as Lyra, discovers a window to access Cittàgazze, a world haunted by Wraiths and a city inhabited entirely by children, Lyra begins to get a bit less selfish and begins to realize some of the true complexities of the alethiometer. The Adventure also deals a lot with the question of Dust or Dark Matter. He also begins to explain about Lord Asriel's rebellion against the Authority and the church. The film will have a much darker tone and add more meaning to the characters' actions in Northern Lights.
