Philip Pullman’s The Subtle Knife wends a different path from its predecessor Northern Lights in that instead of the reader inhabiting Lyra’s world for the duration one now starts moving from world to world.
The UK editions help us keep track of these different worlds with the author’s symbols in the margins of each page: the silhouette of a hornbeam tree for Will’s world (and ours), a dagger motif for the Cittàgazze world, the alethiometer standing for Lyra’s home world and a starburst symbol for the world in which Lord Asriel is building his fortress, the one intended for the republic of heaven.
Within these worlds representing different spaces in the boardgame of Pullman’s imagination the author moves his pawns and knights, his rooks and bishops, his kings and queens. Inevitably during the game some pieces are removed permanently from the board.
Warning: spoilers ahead