With a millenia-long hunt close to is end, Carcharodons Chaplain Manu ventures to the lair of the Drukhari.

In the darkness beyond the galaxy, there are monsters. Some swim closer to the light, drawn by the beacon that is the Astronomican, while others stalk  the Void, predators in the dark. The Carcharodons have hunted for millennia, but now they are drawn into a new blackness… the Dark City of the drukhari itself. Commorragh.
 
For a thousand years, Chaplain Tangata Manu has searched for a relic lost under his watch – an ancient thing, once charged into the keeping of the Forgotten One himself. But at the brink of seeing his hunt fulfilled and the relic returned, it is stolen from under him. Now, if Tangata would see his honour restored, he must lead his hunt against some of the vilest predators the galaxy has ever seen, before they can turn the artefact to their own purposes…