It is revealed that the riverboats and marshes are being used to smuggle and transport heroin, and that Rodrigo had stolen a kilo and sold it, getting him in trouble with the locals. Pedro and Juan continue to investigate, gradually unraveling secrets. The problem proves to be even bigger after a drunk man named Castro tells the detectives about a similar case: his girlfriend, Beatriz, was close to Quini and the sisters, and was found dismembered in the marshes, her suitcase floating there. After disarming and sending him away, the two agree that Quini must be part of whatever is occurring. Quini, now dating another town girl, Marina, manages to sneak up on the detectives after they've followed him and attempts to threaten them with a knife.

Troubled and with no leads, the two attempt to spy on Quini, the handsome and suave former boyfriend of Carmen. Soon enough, both Carmen and Estrella are found dumped in the local marsh, having been raped and tortured to death.

Rocío also gives the detectives a burnt film reel she's found, depicting the girls naked and in bed with a man whose face is obscured by a flash. Although Rodrigo and his wife Rocío say their daughters were average girls, the duo hear from the local police that they were known for their promiscuity, and from their friends that they had a deep urge to leave the town. The detectives meet with the girls' (Carmen and Estrella) father, Rodrigo, a local riverboat skipper. Pedro, openly critical of Spain's past during the Francoist Dictatorship, has a problem with authority figures, while Juan seems not to care, though he has a troubled past of his own. In 1980, Madrid homicide detectives Pedro Suarez and Juan Robles are sent to a ' backwater' town on the Guadalquivir Marshes in Spain's 'Deep South' to investigate the disappearance of two teenage sisters during the town's festivities.

La la land subtitles yifi