Atrocious is a film that portrays the story of two serial killers, who after being arrested for causing a traffic accident, police confiscate some videotapes. These tapes contain brutal murders that show human wickedness, their background, paraphilias and psyche of these murderers.

Quintanilla family was found dead in their country side house. Police reported the existence of 37 hours of recorded evidence. The family traveled to their old farm house, where they investigated about the Legend of the Girl in the Garraf woods. They used to record whatever they did. Atrocious shows the last five days of this family, and the strange situations that they lived in those moments and which remain unexplained.