Mexican horror which through the protagonist Santiago places a criticism on social careerism given that the photographer puts his desire, almost obsession in making a career before everything.
The mass attests to good standards, the director Henaine shows off a good initial sequence shot where the photographer arrives to take photos of the corpse and the direction, even during the film, shows corpses, bloody bodies.
As the film continues, Santiago will find himself entangled in curses and esoteric rites, Henaine through the sound, by altering it, silencing it, makes us understand the protagonist's stage, the loss of his senses, just as the use of out of focus in the ending gives both a nightmare dimension but also means the progressive loss of sight and the sensorial alteration that try Santiago.
Throughout the film there are some clichés and moments that are not too well managed, some appearances behind a bit like telephone calls, a corpse that reanimates as a jump scare and also some speeding up of editing during the nightmares which, if it is true, always serve to disorientate and give the dreamlike sensation, appear somewhat reminiscent with a dated effect.
In the third act, when we delve deeper into the esoteric, with the nocturnal atmospheres the the film gains from it, the ritual, the goat, the Sabbath are suggestive and good moments; in these situations, more breathing room could have been given to such atmospheres given that it is possible to create a certain impact.
It is noted that Hanaine is not, yet, a wise manager of times but in certain moments, such as those mentioned above , manages to create a good performance.

The film focuses entirely on Santiago and partly on his partner Marcela, therefore the other characters are not explored to a great extent, which is not a problem in itself for the type of film, but perhaps more context for the villain would have given it more depth, in those moments from the discovery of the villain to the Sabbath the flow of events is a bit fast.
Narration that knows how to take its time which makes you experience all of Santiago's progressive illness with a direction that, if it could have been managed better and given more cadence to atmospheric moments, still manages to give suggestion in the esoteric moments.

Not bad.