Barcelona, October 1936. The corpses of three patrol anarchists are discovered, one shortly after the other, in the troubled beginnings of the Civil War. They have been undressed, tortured and shot in the back of the neck. There is not a single clue about the murderers. Later, Toni Ferrer, a private detective from Barcelona, is arrested and faces execution. Another so-called stroll. But, to his astonishment, he is led to a questioning centre where he is to meet Juan García Oliver, anarchist leader and the next Secretary of Justice. Oliver gives him a bitter assignment: to catch the killers. From then on, Ferrer will dive into a most complex investigation that will threaten his life. A tangle of shady interests, which nobody is willing to uncover, hides behind an apparently triple political retaliation. As if things were not intricate enough, Regina, a former lover walks into Ferrer’s life again with a dangerous and peculiar request.