The thirteenth apostle

Gabriel Antinori is a Jesuit theology professor assigned to investigate alleged paranormal phenomena. He is also haunted by a past he can't remember. Orphaned, he grew up under the tutelage of Monsignor Demetrio Antinori, the uncle who entrusted him with his first case. Gabriel and Claudia find themselves investigating a case of alleged hemolacria: a young student at Santa Dorotea, a private all-girls boarding school, is crying blood. Gabriel unexpectedly discovers that the phenomenon is linked to a series of drawings that will sow terror and death within the school.

Shocked by the way Gabriel saved Agata, and unable to come up with rational answers, Claudia decides to investigate her past. Demetrio, on the other hand, refuses to believe his nephew, attributing his power to mental tricks caused by stress and an obsession with his past. Stefano, a sixteen-year-old boy, following a physical trauma, begins to have memories that seem to belong to a Nazi soldier. These memories replace his own, stealing his history and personality. Gabriel and Claudia find themselves investigating this unusual phenomenon, which does not appear to be attributable to mental illness.

In a remote village, Rachele, a young girl, returns after ten years, identical to the day she disappeared. Time seems to have stood still for her, but her presence, far from being miraculous, is accompanied by a series of mysterious deaths. Gabriel investigates the secret surrounding her return. The death of Marshal Marini and the return of Muster, who spurs Gabriel to delve deeper into the nature of his gift, lead Gabriel to the agonizing decision to return to the villa where he spent his childhood and where his mother lost her life. Gabriel asks Claudia to accompany him on this difficult journey.

Waking up in Gabriel's parents' villa is filled with disturbing memories. Gabriel is certain he saw his father's ghost and is convinced he died differently than his uncle had always told him. However, his thoughts also converge on the kiss he and Claudia shared that same night. Rosa, a forty-year-old woman confined to a wheelchair due to a spinal cord injury, inexplicably walks again. Yet, behind the apparent miraculousness of the phenomenon, disturbing implications loom. Gabriel will be forced to ask himself the same questions regarding his own gift.

The photos taken by Pietro reach the Directorate and compromise Gabriel's appointment, so much so that they manage to have him removed from the Congregation's new investigations, which are entrusted to Father Isaia. Gabriel, far from Claudia and the Congregation, is free to delve deeper, even into his own feelings. The case Gabriel investigates underscores the fact that the past must always be confronted, not erased: in an elegant Roman home, a woman senses the presence of a ghost haunting her, one she can't name. But what terrifies and unsettles doesn't always come to destroy.

Arriving in time to save Claudia, Pietro will pay the ultimate price for his heroic deed. Blinded by grief, Gabriel realizes that there can only be one person behind Claudia's attack, the only one to whom he had confided where they were going: Isaiah. While Demetrio delivers Isaiah to the Candelaio, Serventi mercilessly interrogates Alessandro Foschi, aiming to discover where he has hidden the anti-gospel that would allow Gabriel to anticipate his moves. Foschi, however, wants Gabriel to know everything, so he can finally choose who he is, and so decides to remain silent.

Gabriel and Claudia are far from each other: he is busy searching for his enemy Serventi, she is struggling with a new life to forget an impossible love. But fate forces them back together, and as before, they must solve the mystery of a man capable of healing every physical ailment. Gabriel investigates the mystery of the stigmata: a young nun with wounds that were said to have opened by the will of Christ. Claudia believes this to be a serious religious delusion, but Gabriel discovers an ancient mystical ritual behind the mystery.

Gabriel's miraculous return to life binds him even more to Claudia, but there are those in the Congregation who doubt him and there is great concern about his powers. Gabriel must also solve the mystery of the corporeal apparition of a boy in an irreversible coma. Gabriel and Isaiah find themselves facing the toughest battle of all: the one with the devil incarnate. A town has been subjugated by evil. Their only hope lies in the help of a famous exorcist, who will find himself settling accounts with an ancient enemy.

Gabriel investigates evil presences in an ancient villa, where unsated ghosts from the past return to influence the present, endangering Claudia and Gabriel's lives. A married couple have moved to a small town near Rome, purchasing a villa that appears to be haunted by evil spirits. Inside a juvenile prison, an orphan boy nearing the end of his sentence manifests psychokinetic powers that allow him to hurl both objects and people. This power manifests whenever the boy hears a female voice in his mind and experiences memories of sexual assault.

Gabriel must verify an apparition of the Virgin Mary in a suburban village. Gabriel must navigate the religious fanaticism of the faithful and the rigid dogmas of the ecclesiastical elite, questioning the meaning of faith. A girl, almost completely drained of blood but still alive, unleashes fear in a country village. Gabriel and Claudia must confront a legendary creature: a vampire. Gabriel, tormented by his powers, must decide whether to leave the Church.

Gabriel has left the priesthood to live with Claudia, when his patient and old friend, Francesca, manages to bring to life a demonic monster capable of emerging from a person's dreams and then killing them in reality. The nightmare also interacts with Claudia, who falls victim to it. A young woman hears her dead son's cries deep in the catacombs near her home, and the same sounds are heard first by a medium and then by the local parish priest. Everyone in her family believes she's a poor madwoman, but the girl refuses to give up and manages to contact Father Gabriel and Claudia.

Claudia is taken hostage by Bonifacio Serventi's organization, which uses the moment to initiate a malignant process within Claudia so that Gabriel, in addition to using his dark power against Serventi himself, can use it. For Gabriel, it is the final showdown: caught between Serventi, who wants him to be the chosen one and embrace his dark power, and the Warrior Order, who wants to eliminate him for his very power. Gabriel is alone and risks losing Claudia forever.