Barcelona, 1960. Helena's husband is in jail and she needs money to get him a decent lawyer. She finds work with the gangster Malpica, a heroin importer and distributor. A drug turf war is underway and Malpica is quite ruthless, leaving a trail of dead bodies in his wake. The string of murders has the police interested and they have a team trying to identify the culprit. The police investigations and drug war also put Helena in the firing line. In her new world, Helena is known simply by her initial - Hache.