The Rose Field by Philip Pullman

In 'The Rose Field', the quests of the characters converge in the most dangerous, breathtaking and world-changing ways. They must take help from spies and thieves, gryphons and witches, old friends and new, learning all the while the depth and surprising truths of the alethiometer. All around them, the world is aflame - made terrifying by fear, power and greed. As they move East, towards the red building that will reunite them and give them answers - on Dust, on the special roses, on imagination - so too does the Magisterium, at war against all that Lyra holds dear.