Trinity Blood.

A routine flight aboard the airship Tristan turns deadly when the craft is hijacked by the vampire Alfred, a member of the radical group, Fleurs du Mal. Unless Alfred's demands are met, he intends to crash the Tristan into the heart of Rome. Only Abel Night road, a passenger on the ship and a touring priest for the Vatican, stands between the vampire and the destruction of the Holy See.

While investigating the activities of the Fleur du Mal, Father Night road encounters a young girl with strange and dangerous abilities. And when the girl attempts to flee, Abel must turn against his own comrades in order to save her life and prevent her from falling into enemy hands.

Abel, night road journeys to Ishtvan, a city where the tenuous balance of power between the Human and Vampire worlds is threatened. With the vampiric Count Gyula secretly preparing a weapon of mass destruction and the Vatican's Sister Esther carrying out her own personal war, Abel finds himself caught between a rock and a hard place.

With Esther and Abel his prisoners, Count Jula reveals his plan: to use the Star of Sorrow to rain destruction down on the human race in revenge for his wife's murder. But the mysterious order of Rosen Kreuz has its own plot for twisting Jula's scheme to achieve their evil ends. If Abel can't stop them, the world could face Armageddon all over again.

Father Abel Nightroad escorts Sister Esther to Rome, where she meets Lady Caterina Sforza. While there she also meets William Walter Wordsworth, Father Havel, and Sister Noelle Bor, who all do their part to welcome her into the AX. While lost on the grounds, she encounters a young boy crying, who later turns out to be Pope Alessandro. With this being her introduction into the ways of the AX, has Sister Esther gotten herself into more than she can handle?

A murder on holy ground has taken place in Amsterdam, and Lady Caterina sends in the mysterious Father Hugue, also known as "Sword Dancer", to investigate. The local leader of the vampires, Cabel, knows the he and his followers are not responsible, but only the unconscious memories of Agnes can help him prove it. But with so much at stake on the investigation's outcome, no one can be trusted and no one is safe.

When ships off the coast of Albion are attacked by what appear to be vampire fairies, Abel seeks out an old comrade, Leon, a former A.X. member now doing hard time, to help him investigate. In exchange for his assistance, Leon will get his prison sentence reduced--assuming, of course, either of them survives their assignment.

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. 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.

While Esther recovers from her injuries with the help of the mysterious child Seth, Ion is stunned to find himself face to face with the supposedly dead Radu, who challenges him to stop him from killing the Empress. He also plants a seed of doubt in Ion when he tells him of Esther's past...doubt that could spell disaster for them all.

Ion Fortuna and Sister Esther find themselves unwitting pawns in an elaborate plot to murder the Empress -- one which reveals a more sinister treachery emerging from the shadows. Together, they must face ghosts from the past in order to secure a future for the Methuselah/Human alliance.

Esther and Ion must fight to survive in prison, while Asta and Abel rush to save them. After being publicly accused as a traitor, Suleyman soon discovers that there is no way to deny his accustations as it turns out that Seth is the Empress. Abel rushes to stop Dietrich (disguised as Radu) from repairing and using a weapon of mass destruction. Dietrich retaliates, and Abel is saved by Seth, who has revealed herself as his sister. Seth warns Abel that Cain is still alive, and he sets out to find him.

During a state visit to Londinium to attend the funeral of the Queen of Albion, Esther and the Pope are trapped in the underground factory known as the Ghetto when vampire terrorists attack. The A.X. team races to save them, with the grudging assistance of Petro and Paula of the Inquisition...and depending on Abel's mysterious knowledge of the Lost Technology.

Pope Alessandro finds temporary refuge among the workers of the Underground Ghetto as the members of A.X., the Inquisition and the rebel terrorists all race to find him. But the Rosen Kreuz Order lurks in the shadows, ready to exploit the Albion crisis for its own sinister purposes.

Death Hunters attack the vampires of the underground Ghetto as Petro battles to lead the Pope to safety. Abel faces off against Dietrich...and against someone far more powerful and closer to him than he could've expected.

Cain, having killed his brother, Abel, plots with Kampher to destroy the people of Rome and, soon after, the world. The Vatican and the kingdom of Albion join forces to fight against them. Virgil reveals an important secret to Esther that will forever change her destiny. Will she be strong enough to accept it and use it to help the people of Londinium?

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?