As was the case with Marta's death, the discovery of Barislav’s body yields no DNA evidence. But clues are later found at Barislav’s house.

Pablo confronts Héctor over photos linked to the murder. Héctor submits to a polygraph test.

Héctor searches Francisco’s phone. Fernando has a face to face meeting with Cristina in prison. Investigators discover letters belonging to Fernando.

Héctor studies the anonymous clues that Fernando received. Sergio finds Agneska and Pablo together.

Kaled finds a bloodied youngster on the highway. Héctor finds out that she has an interesting tattoo. The girl manages to utter a name: Vlad.

Lola and Salva arrive in prison and search for a book with mysterious letters but end up finding nothing. Héctor receives new information.

Guineans and Roma encounter each other after mass. Sergio goes to see his brother in prison. Sergio makes mention of an interesting blog.

A woman accuses Pilar of having imprisoned her. Vlad faces off against the head of the gang. A big secret is finally revealed.

The investigators see the photos and look at the silhouette of what looks like a bike. The investigators identify the model.

Vlad informs the investigators that he has exculpatory evidence in his house. Fernando is threatened in prison.

Héctor investigates and discovers that Cristina was abused by her father when she was young. The police find a notebook full of numbers and charts.

Rueda barely survives. Lola, Héctor, and Salva arrive and find the murderer. They later manage to uncover the killer's identity.