In a small Spanish town, a former police detective, León, grapples with his dark past and deteriorating health after retiring under mysterious circumstances. His quiet life is disrupted when an old friend, now a prominent journalist, reaches out for help investigating a series of gruesome murders plaguing the region. Each victim seems to have been terrorized by an unseen force, and local authorities are baffled by the sheer brutality of the crimes. León, haunted by visions and battling his own demons, reluctantly agrees to assist and is soon drawn into a labyrinth of lies, corruption, and hidden agendas.

As León delves deeper into the case, he discovers eerie connections between the murders and a wealthy, influential businessman who wields significant power over the town. Navigating through layers of deceit, León encounters a cast of suspicious characters, each with their own dark secrets and potential motives. As he inches closer to uncovering the truth, he begins to suspect that the horrors of his past might be intertwined with the present terror. Tensions rise as León's investigation threatens to unravel everything he holds dear, leading him to confront not only the malevolent forces in the town but also the shadows lurking within his own soul.