Christian and Lilith have made contact with Azazel, leader of the Grigori, and have learned a startling truth. Devils have infiltrated the Catholic Church. Now it's up to them, the Grigori, the Succubus Enclave, and the nearly-defeated Executioners to face off against a group of Devils who are hellbent on opening a gate to the Underworld. If they can't stop this from happening, then the whole world will burn as a result.
The heat is on.