Mad Kat Skratch and the survivors of her ill-fated raid into The Cutoff deep within Hive Cambricus have found themselves in even stranger territory as they head into the strange Underhive Jungle of The Wald, far from their regular haunts, in search of the fabled lost Chem Lab rumoured to be within, a legend of the House of Blades that has gripped Kat's increasingly fevered mind.