Following a horrible car accident on a rural wooded road near Mexico City, Agata goes into a coma, and her identical twin sister Catalina begins to experience the pain and terror that her comatose sister is going through.[4] Catalina must try to solve the mystery of her sister's accident next to the Km. 31 marker and discovers a local legend that tells of malignant spirits that prowl the road and who are said to prey on travellers.[5] Following a series of terrifying events, Catalina realizes that their link is growing stronger and that her sister is screaming for help from her unconscious state.[6] With the help of her Spanish boyfriend Nuño, Agata's boyfriend Omar, and local detective Martin Ugalde, she discovers that Agata is trapped between life and death, between reality and a terrible netherworld of evil spirits and ancient legend.[7]
Reception
This section needs expansion. You can help by adding to it. (March 2018)
The film was released on February 2 and was on top in the Mexican box office that weekend.
[8]
The film was released in select cinemas in the United Kingdom, with English subtitles, on December 7, 2007 after its premiere at the Empire Cinema in Leicester Square on 6 November 2007.