[3] It swept the 29th Goya Awards, winning ten categories, including Best Film, Director, Original Screenplay, and Leading Actor (Gutiérrez).

Although Rodrigo and his wife Rocío say that 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 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 digging through more victims' items, the two see a pattern of out-of-town job brochures for women, eventually linking Quini to a man named Sebastián.

Juan and Pedro deduce that Quini and Sebastián were luring the young women of the town, who were aching to leave and find their own independence through work, by passing these brochures around and then entrapping them into sexual slavery at a local hunting lodge.

Though Juan justified his shooting story by saying it was his former partner's actions, the journalist reveals that he had in fact been a brutal officer in Franco's notorious secret police, and to have once been known as "The Crow".

The website's critics consensus reads: "As narratively taut as it is richly atmospheric, Marshland keeps viewers guessing throughout a procedural thriller with surprising nuance.

[5] Jay Weissberg of Variety deemed the film to be "a satisfyingly atmospheric neo-noir", even if it ultimately disappoints in its denouement, leaving many questions unanswered.