Following a horrible car accident on a wooded road near Mexico City, Agata goes into a coma. Her twin sister Catalina must try to solve the mystery of her sister's accident next to the Km. 31 marker and discovers a terrifying local legend.

While driving through the kilometer 31 of a lonely road, Agata Hameran hits a boy. She leaves her car to help the victim and another car runs over her and she falls in a deep coma. Her twin sister Catalina telepathically feels the pain of Agata and hears her whispering for help. Together with her boyfriend Nuno and Agata's mate Omar, they return to the km 31 of the road, and find out that the place is surrounded by supernatural accidents caused by the ghost of a mother that lost her boy many years ago. Further, Catalina discloses that the spirit of Agata is trapped between the worlds of the living and the dead.—Claudio Carvalho, Rio de Janeiro, Brazil

After the tragic death of their mother when they were children, twin sisters Agata and Catalina Hameran developed a special skill, a way of communicating without speaking, a "link" between them. After a mysterious accident on Kilometer 31, Agata falls into a coma. Catalina, thanks to their "link", feels the pain and tragedy that her sister is going through at the time of the accident. Following a series of supernatural events, Catalina realizes that their "link" is stronger than ever and that her sister Agata is screaming for help from her unconscious state. Catalina is now determined to find out what really happened to her sister in order to help her wake up. Nuño, Agata's long time friend, and Omar, Catalina's boyfriend, agree to help her. But they soon find out that not only is Agata in a coma, but she is also trapped between reality and an ancient legend, the legend of La Llorona.—Anonymous