Isabel, a young student of architecture, visits a residence in the magical town of Tepoztlán (Mexico) as part of the activities she performs for the office where she works. After several hours of studying the house and imagining the future aspect of it, Isabel is attracted by the hypnotic melody of a musical box that lies within a room of the house. The music takes Isabel to a library that holds countless art objects and travel memories that the venerable Regina, owner of the house, has collected throughout her life. On a dusty table, Isabel finds the musical box and next to it, a collection of old mirrors that unintentionally breaks due to her lack of care. The profanation of Isabel will provoke the manifestation of "Aluca", an evil spirit that dwells in the mirrors, whose intention is to seduce, exhaust and lead its victims towards suicide. Isabel's fateful destiny will culminate with the liberation of Aluca, in this haunted house and inhabited by more demons than it appears.