Picking up where Blood Beast left off, Grubbs is on a plane in a dire situation face-to-face with Lord Loss and Juni Swan who has just been revealed to be one of his higher ranked familiars.

Once Beranabus and Kernel return from demon hunting, they all discover that the Tunnel that Bec had sealed 1600 years ago has been opened, and the Demonata are invading in force.

After arriving at the tunnel, Kernel's eyes are gouged out by Spine, a familiar of lord loss and Grubbs sees the heads of all his loved ones held by demons, barring Bill-E.

In the chaos, the Kah-Gash, a mysterious weapon capable of destroying a whole universe, and an objecti d of Beranabus, awakes in the trio, allowing them to use the demonata's Tunnel to go back in time to before it was opened.

Now knowing what is at stake, Grubbs leaves Dervish in the care of Bec and joins Beranabus and Kernel in their effort to stop more tunnels from being opened, and to find out the nature of the Shadow.