Turin, Italy becomes the backdrop for a tense pursuit as a missing-person case spirals into a chilling serial-killer investigation. Linda, a French flight attendant, joins forces with Inspector Enzo Avolfi to locate Linda’s younger sister, Celine, who has vanished at the hands of a sadistic killer known only as “Yellow” (Giallo). The case threads through a city of shadowed streets, seedy taxi rides, and a pattern that seems personal as much as it is murderous, with the killer preying on beautiful, foreign women and documenting his offenses with photographs that feed his own perverse gratification.
A break in the case comes when a body is found outside a church near a fountain: an Asian woman is alive, her whispered words hinting at a clue that connects language, faith, and fear. A translator uncovers that the woman was praying Buddha and muttered the word “yellow,” a clue that leads them to the killer’s suspected identity. In the morgue, Linda contemplates the killer’s face, and the coroner, Massimo Franceschi, explains a medical thread: yellow skin can be a sign of liver disease, suggesting the killer might be awaiting a new liver. This medical thread adds a grim layer to the cat-and-mouse dynamic, hinting that the killer’s timing could hinge on health as much as on opportunity.
The investigation drives the duo to the hospital where a confrontation with Giallo briefly surfaces. He escapes, leaving a trail of torture devices in his wake. Enzo learns the man’s real name is Flavio Volpe and tracks his address, only to find Giallo’s apartment empty, a chilling showroom of confinement and fear. The pursuit deepens as Enzo reveals his own origin story: years earlier, he witnessed his mother’s murder by a local butcher who had owed money, and in a brutal turn of justice, Enzo killed the man years later in his own shop. Inspector Mori, the elder figure who had taken him in, understands why Enzo carries this weight. The detective even emphasizes a personal memento—the knife he kept from that fateful night as a constant reminder of the reasons he became a cop. The backdrop of Enzo’s past shapes his suspicion that Giallo is not just a randomly violent offender but a pattern killer who channels ugliness and deformity into a hatred of beauty.
As the case unfolds, a backstory of Giallo surfaces on screen: the killer’s mother was a prostitute who gave him up for adoption at a church, and the orphaned children who resided there bullied him. This origin provides a troubling context for his fixation on power, control, and the corruption of innocence. Celine fights to escape, but she is recaptured. In a cruel turn, she attempts to bargain with him by claiming wealth and reward, a ploy that only escalates the danger around her.
The intrusions don’t stop at Giallo’s lair. He infiltrates Linda’s apartment, demanding a ransom for Celine’s safe return. The pursuit culminates in a dramatic hotel showdown: Enzo and Giallo exchange gunfire, and the killer — in a last desperate bid to flee — plummets from a skylight to the lobby floor, dying instantly. Yet the immediate threat is not over; the police search the killer’s apartment and an abandoned gas factory, looking for Celine and any other victims who might still be alive behind the ominous walls and machinery.
Tension builds as Linda begins to blame Enzo for the disappearance of her sister, accusing him of selfishness and hardness as he asserts that trusting Giallo would be a mistake. He attempts to reassure her with a careful, reasoned defense of his role as a protector, but the emotional strain tests their partnership. The case takes one last turn when, during a routine patrol in a dimly lit car park, a patrol officer hears a muffled cry from the trunk of Giallo’s car: Celine, alive, is found and removed from danger just in time.
Along the way, a wide cast threads through the investigation: Russian Woman offers a fragment of the city’s human texture; Butcher's wife presences hint at domestic violence’s echoes in the killer’s psyche; Delivery Boy and Sophia populate the world with ordinary people who witness or contribute to the unfolding drama; Nurse, Security Guard, and other supporting roles add texture to the hospital corridors, the crime scenes, and the moody streets of Turin. The narrative also brushes against the lives at the periphery—vehicles and storefronts, taxi rides and church bells—that create a cityscape where danger can arrive at any corner.
In the end, the pursuit of a single killer exposes a cascade of secrets: a man shaped by trauma, a woman driven by love and fear, and a police force trying to hold together the threads of motive, opportunity, and mercy. The resolution hinges on presence of mind, courage, and the stubborn refusal to let a story of violence end without light. As Linda and Enzo Avolfi confront the aftermath, they confront what it costs to save someone you love—and what it costs you to keep faith in a system meant to protect the innocent.
