Members of A.X., the Inqusitorial Department, and the crew of The Ghetto join forces to stop Kampher and the Order of Rosen Kreuz from destroying Albion and, soon after, the world. Caterina sends Father Tres on an urgent mission, which Cain intends to stop. With Abel defeated, what chance does anyone have against the Contra Mundi?

After the inexplicable collapse of the National Palace, Abel and Sister Noelle are sent to Barcelona to investigate. The beautiful city inspires Noelle to reveal her true feelings for Abel. But unbeknownst to the unlikely couple is an agent of evil waiting in the wings, one that's armed with a weapon that threatens to ring in the sounds of death and destruction.

Though grief stricken by the events in Barcelona, the agents of A.X. scramble to prevent Rosen Kreuz from carrying out their plan to destroy Rome with the Silent Noise device. But they may have to act without Abel, who turns in his gun because of his failure to stop Kampfer...just when the power of the Crusnik may be needed most...

Archbishop D'Este plans to use The Silent Noise, a destructive sound-wave device, to destroy Rome. Lady Caterina is held under house arrest for her suspicions, and is secretly brought before D'Este so he may try to persuade her to join his cause, and to join forces with the Contra Mundi. Abel, still distraught over the loss of Sister Noelle, arrives in time to save her from D'Este, only to encounter a new foe: Isaac Fernand von Kampfer, a high ranking official of the Contra Mundi. Who is this new enemy, and what secrets and powers might he possess?

In Venice, Abel teams with an agent of the Empire, the vampiress Astaroche Asran, to hunt down a vampire mass murderer of humans, Enderle Kudza. But Astaroche has a personal grudge against Enderle and a great deal of contempt for what she regards as Terran interference. Abel may have a hard time determining who the greater danger is: the mass murderer... or his vengeful partner...

Whispers of an assassination attempt on Lady Caterina are validated when a vampire, Ion, attempts to contact her unannounced. The Vatican responds by sending an execution squad, intending to slay first and ask questions later. However, Father Abel makes a startling discovery that could mark a turning point in the conflict.

The race is on! Imperial Messenger, Ion Fortuna, flees the clutches of Brother Petro in an attempt to meet with Lady Caterina, who has also attracted the ire of the Inquisitorial Department. Alone and outnumbered, Father Abel tries to aid Ion with help from Sister Esther. However, the real threat is unmasked as an Imperial double-agent, bent on shooting the Messenger!

Dietrich...the Puppet Master...seizes control of the Inquisition air ships and turns them against the city, while at the same time sending a monstrous new type of undead assassin against Caterina. Abel, Esther, Ion, and a reluctant Petro race to head off the threat...even as the traitor Radu prepares to end Ion's mission of peace once and for all...

Esther and Abel accompany Ion back to Byzantium, capital of the Empire, to meet with the Empress. But when mysterious assailants attack Ion's home and apparently murder his grandmother, Ion finds himself accused of the crime. With the assistance of his old comrade Asta, Abel must help Ion clear himself with the Empress...who may have a secret of her own...

After escaping to the refuge of Asta's mansion, Asta and Abel devise a plan to clear the name of Ion Fortuna, who is now suspected of the murders of his own family. They decide to attend a council meeting held by The Empress to plead his case. In the meantime, Ion and Esther search the city for Minmarl, a man that Ion believes may hold some clue as to who actually committed the murders.