VOX The Edge Chronicles by Paul Steward and Chris Riddell

When young librarian knight Rook Barkwater is taken captive and forced to work for Vox Verlix – nominally the Most High Academe, but no more than a prisoner in reality – he stumbles across a terrible truth. Vox is brewing a plot to destroy the goblins and the shrykes at a stroke, so that he can seize control of the Edgeworld for himself. VOX The Edge Chronicles by Paul Steward and Chris Riddell ( hard cover)