The book starts with Grubbs fighting a demon alongside Beranabus and Kernel in the Demonata universe.

They discover that the Lambs were responsible for the attack on the Grady's home in Carcery Vale and it is decided that Grubbs should go after them to find out more.

Upon their arrival, they find a man named Antoine Horwitzer in charge, in place of the missing Prae Athim.

Grubbs, Meera, Prae and Timas try to escape by sea since the werewolves cannot swim but ultimately find themselves surrounded.

Grubbs agrees not to kill Antoine if he calls his Lambs off their attack and has them escort Bec and Dervish to safety.

When Grubbs gets back home, he finds Dervish has decided to stay and die instead of going to the Demonata world.