What if a serial killer based their crimes on the most unsettling principles of quantum physics? That’s the premise of ‘The Uncertainty Principle’, Sònia Guillén’s gripping thriller that will captivate readers with a fast-paced plot and a terrifying countdown.

Inspector Estrada and criminologist Nadia Mateo face a case that defies all logic. A killer, who signs his crimes as Squark, kidnaps people leading double lives—an executive who moonlights as a street musician, an anonymous painter who turns out to be the world’s most famous graffiti artist. Obsessed with quantum superposition, he designs his murders around some of science’s most famous experiments, trapping his victims in an uncertain reality—like Schrödinger’s cat, both alive and dead at the same time.

To stop Squark, the police ask Claudia Fernández for help, a brilliant quantum physics PhD struggling with a deep personal crisis. With time working against them and a criminal mind always one step ahead, Claudia, Estrada, and Nadia must decipher the killer’s cryptic messages before his experiments end in tragedy. But what they don’t know is that they themselves are pieces in a much larger game.

With a plot that blends science, suspense, and relentless pacing, ‘The Uncertainty Principle’ turns quantum physics into the backdrop for a deadly intellectual hunt. Every page is a challenge, every clue a puzzle that readers will try to solve alongside the protagonists.

Sònia Guillén, a seasoned writer with a passion for intelligent storytelling, immerses us in a novel that not only plays with the classic thriller genre but also makes us reflect on our own identity and the multiple lives we lead without realizing it. If you enjoy mysteries, high-stakes chases, and unexpected twists, this is a book you won’t be able to put down. And don’t worry if you’re not an expert in quantum physics—it’s the perfect excuse to get even more hooked on this addictive thriller.