In the gritty gyms of post-war Zaragoza, Martín Baumer—once a promising boxer—is now a broken sparring partner with nothing left to fight for. But when an old friend calls with a plea that reeks of desperation, Martín boards a train to Madrid, stepping into a web of betrayal and blood. A single moment at a warehouse changes everything: a stabbing in the crowd, a body in his arms, and a city ready to condemn him. With no witnesses and no way out, Martín must face the toughest opponent of his life—his past.

Spain, 1950s. The corpse of an unknown person appears in the town square of Bocentellas, within the mythical territory of Región. The inhabitants will ask for help to Captain Medina, young officer in command of a nearby military fort, until the arrival of the judge.