A new threat has emerged on the eastern fringes of the Imperium: a voracious alien swarm, made up of many species, named for the first world they destroyed: tyranids. Inquisitor Fidus Kryptman, desperate to find a way to defeat these beasts, visits a secretive Adeptus Mechanicus laboratory, with one goal: to discover more about this xenos foe. As the tech-priests open a seemingly dormant alien spore, Kryptman tests the creatures within, to discover their capabiltiies - and how they can be killed. But can the tyranids be contained, or do they have the inquisitor and his allies exactly where they want them? Read it because It's a very different type of story from Rob Sanders, focusing on the dark underbelly of an inquisitor's work.