Sebastián's girlfriend, Mariana, is ready to set off for the trip they have planned. However, it's almost time to go, and her normally punctual boyfriend is nowhere to be found.

The plane is about to leave and her boyfriend, Sebastián, still hasn't arrived, causing Mariana to worry that something has happened to him.

Desperate for answers, Mariana decides to go to Sebastián's house to look for him personally, thinking he may have changed his mind about eloping with her and never imagining the awful truth.

When Mariana gets stood up by her boyfriend, with whom she was planning to elope, she becomes worried about him and arrives at his home with her friend, Paola, to try find out what possibly could have happened.

After Mariana spots Sebastián through the window of his home, she is even more eager to find out why he stood her up and continues knocking on the door until his mother, Doris, finally opens it and invites her in.

To top off Mariana's uneasiness when speaking to her boyfriend's overbearing mother, following a glass of mango juice served by her, she starts to feel queasy.

Paola begins to suspect that something bad might be happening to her best friend Mariana and calls the radio show "Tu Voz Estéreo" [Your Stereo Voice] for help.

Paola has called the radio show "Tu Voz Estéreo" [Your Stereo Voice] for assistance with her friend Mariana's potentially precarious situation inside her boyfriend's crazy mother's house, and the hosts arrive in no time to help out.

The team from the "Tu Voz Estéreo" [Your Stereo Voice] radio show has finally arrived to help Paola figure out what has happened to her friend Mariana inside the home of her boyfriend and his crazy mother. However, no one can imagine the horrors that Mariana is enduring.

Suspecting that her friend Mariana is in danger at the hand's of her boyfriend's mother inside their home, Paola wants to enter as soon as possible to find out what's going on. However, the help she has enlisted from the hosts of the radio show Tu Voz Estéreo [Your Stereo Voice] inform her that they must obtain authorization from the police in order to enter the home.

When the police finally arrive, a hysterical Paola implores them to enter the home of Doris and her son Sebastián as soon as possible to find out what has happened to her best friend Mariana.

Doris discovers that the police are outside her home and attempts to flee with her son.

As Doris flees from the police, they enter her home to find a wounded Mariana and a chemical stench in the air.

In the conclusion to her interview with the team at the radio show Tu Voz Estéreo [Your Stereo Voice], in the wake of some tragic events involving her friend Mariana and Mariana's boyfriend's mentally disturbed mother, Paola offers an update as to the fates of both.

Pipe, his girlfriend and his mother attempt to find the perfect spot in their apartment to put up their Christmas tree.