Genre: Historical Crime Fiction, Mystery, Thriller.

Subgenres: Gothic Thriller, Psychological Suspense, Historical Detective Fiction, Macabre Crime Mystery.

Setting: Montecatini Terme, Tuscany, Italy, with references to Florence, Pisa, Rome and Düsseldorf, Germany.

Period: First half of the twentieth century. The precise year is not explicitly established.

A horrifying discovery at the railway station of Montecatini Terme plunges the peaceful Tuscan spa town into a nightmare. Inside an abandoned freight wagon, investigators discover five perfectly embalmed bodies, arranged in a grotesque theatrical composition. Four victims sit around a table as though engaged in a game of cards, while a young woman lies on a bed with a dagger embedded in her chest. The extraordinary preservation of the corpses defies conventional medical explanation, suggesting the involvement of a criminal possessing exceptional scientific knowledge.

Called upon to assist the local police, the celebrated writer and unconventional investigator Gabriele D'Annunzio immediately recognizes the disturbing characteristics of an earlier criminal nightmare. The evidence points toward a mysterious physician calling himself Dr. Kürten, whose appearance, abilities and methods bear an almost impossible resemblance to those of the infamous Vampire of Düsseldorf, a sadistic murderer whom D'Annunzio once helped bring to justice.

But how can a man apparently connected to a criminal executed years earlier emerge from obscurity to perpetrate another series of meticulously orchestrated atrocities?

Accompanied by his courageous lover and trusted collaborator Eleonora Danieli, and supported by his resourceful assistant Fernando, D'Annunzio begins an investigation involving unidentified victims, mysterious women, concealed identities, chemical experiments and a sinister network of manipulation.

The enigmatic doctor proves to be an adversary of extraordinary intelligence. Rather than avoiding suspicion, he appears to welcome confrontation, anticipating the investigator's movements and transforming every encounter into a dangerous psychological contest. His elegant manners conceal an almost unimaginable cruelty, while his scientific expertise and elaborate mechanical traps make his residence a labyrinth of deadly surprises.

As the investigation advances, the stakes become increasingly personal. Threats against D'Annunzio's closest companions force him to confront an enemy who seems determined not merely to escape justice but to destroy the investigator's reputation, happiness and everything he holds dear.

Meanwhile, the appearance of vulnerable witnesses and a mysterious woman named Penelope Carnevali introduces further disturbing questions about the doctor's past, his hidden ambitions and the connections linking seemingly unrelated crimes.

Against a backdrop of gothic terror, scientific obsession and psychological warfare, D'Annunzio must combine intelligence, courage and audacity to challenge an adversary who considers himself intellectually invincible.

A sinister historical thriller in which the boundary between reason and nightmare becomes increasingly uncertain, and where discovering the truth may demand a terrifying personal sacrifice.

The Vampire of Dusseldorf

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