Front of Aragon, 1937. Lluís, a young republican officer destined for a temporarily dormant position, meets an enigmatic widow of whom she falls in love, Carlana, who manages to fool him to falsify a Document that makes it the lady of the region. The best friend of Lluís, the Soleràs, a degraded officer, discovers the fraud and, in exchange for not exposing him, he demands that he move away from the bombings of Barcelona his son and his wife, from whom he is Secretly in love When Trini arrives at the town, it does not take long to discover the betrayal of Lluís and establishes between them two a "state of war" that will make all moral bases stagger.
On an ordinary day in bustling downtown Madrid, life ticks over as usual, while inside a decrepit and noisy central bar, a motley assortment of common urbanites is killing time indolently, up until a loud gunshot sends chills down the spine. Out of the blue, now a man lies dead in front of the bar in a pool of blood, and then surprisingly, in broad daylight, another death follows. Where did that mysterious lethal bullet come from? Is this an act of terrorism or is there a solitary invisible sniper hidden on a roof? As hysteria prevails and the bodies miraculously vanish into thin air, the perplexed and terrified bar's regulars are bound to turn on each other, paranoid and suspicious of the potential assassin who might be hiding inside the place. Is there indeed a wolf among sheep?