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Mexico in the 1950s. The young beauty Noemi receives a strange letter from her cousin and childhood friend. Catalina has recently been a happy bride and sent postcards from her honeymoon, and now she begs her sister to save her from certain death. Noemi sets off to rescue her at the House on the Mountain, the Doyle family estate. As she tries to find out the truth, she discovers that there is something wrong with the house. Something (or someone) is trying to take over her mind. In addition, the girl learns that the once glorious Doyle family is involved in bloody deeds. And the head of the family, Mr Howard, has the most deaths and secrets on his record. What he once did for the sake of wealth and long life is madness... Noemi has to put an end to the horrors that have been hidden by the gloomy walls of the House on the Mountain for centuries. However, she does not realise that once someone crosses the threshold of the house, there is no chance of escaping...