A ruthless serial killer kidnaps and tortures his victims following the principles of quantum physics. Inspector David Estrada races against time to uncover the identity behind the alias “Squark,” the criminal terrorizing an entire country. A fast-paced psychological thriller filled with action, unexpected twists, and an original quantum physics component that adds a layer of elegance and uniqueness.
When underground artist Sara Pons, known as CorpseArtist, disappears after inviting a stranger into her home, the case lands in the hands of Inspector David Estrada and his partner Nadia Mateo. What seems like a kidnapping becomes a twisted intellectual game when the criminal, using the alias Squark, leaves coded messages referencing quantum physics, daring investigators to “open Schrödinger’s box.” The key to understanding him lies with Dr. Berta Fernández, a brilliant but emotionally blocked physicist.
Sara is found dead after 60 hours locked inside a sealed box. This marks the beginning of a series of crimes designed as human experiments, using quantum theories as the pretext for methodical sadism. Squark’s second victim, Joan Torres, is used to demonstrate quantum entanglement: Joan is brutally tortured while his twin brother, a famous YouTuber, attempts to save him live on camera. Despite Estrada, Nadia, and Berta’s efforts, Squark escapes. Media pressure and the involvement of the YouTuber turn the case into a viral phenomenon. Emotionally marked by his past work on the unresolved Susqueda reservoir murders, Estrada finds himself dragged into another nightmare.
When Sergio Miranda, a tax advisor with a double life, is identified as the killer, police breathe a sigh of relief—until his body is discovered. Miranda was just another victim. Squark targeted him to illustrate the double-slit experiment, where light and matter behave as waves or particles, altered simply by the act of observation. No matter how hard the investigators try, Squark remains at large and continues killing. One of his victims, the magician DiMaggio, survives and proves key in identifying the killer: Squark is Albert Turiel, a brilliant young man and heir to a tech company, raised in an abusive household. His second-to-last victim is his own father, who psychologically abused his mother for years and is found dead at the company headquarters.
Finally, Squark takes things even further: he kidnaps Nadia and Berta to stage his ultimate version of Schrödinger’s experiment. Two women. One box. The Susqueda reservoir. And a live broadcast watched by millions. The choice of location is no coincidence: Squark’s mother, who vanished 20 years earlier, was born there. Is Squark the very Susqueda killer that Estrada failed to catch years ago? Estrada’s desperate intervention prevents a total tragedy—but only manages to save Nadia. Berta dies. And although Squark appears to have been shot, the body is revealed to be Pavel, Berta’s colleague. In the final scene, Albert—Squark—has escaped under a new identity. The experiment continues.
RELEVANT INFORMATION: Sònia Guillén was a university professor in Innovation and a labor consultant before giving it all up to pursue writing. Since then, she has published four novels and has been a finalist for the Ciutat de Picassent Prize, winner of the 2023 Ramon Muntaner Prize for YA fiction, and the Manuel de Pedrolo Prize for narrative and science fiction.
Her latest book, The Uncertainty Principle, is an elegant, dark, and contemporary thriller that blends emotionally intense scenes with restrained action and a powerful atmosphere. Forests, reservoirs, labs, and police stations become almost psychological landscapes. The narrative is fragmented, relying on multiple points of view and parallel structures that invite readers into ambiguous terrain, enhancing the novel’s psychological depth.
Stylistically, it adopts a somber and realistic tone with symbolic touches—reminiscent of True Detective’s introspection and the emotional logic of series like Unorthodox or Mare of Easttown. The scientific component stands out as a core element driving the killer’s perverse motivations, making it ideal for a cinematic adaptation. The story ends on an open note, leaving room for future seasons or continuations.
AUDIOVISUAL POTENTIAL: TV Series, Miniseries, Feature Film, TV Movie
AVAILABLE LANGUAGES: Spanish, Catalan
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