El invernadero (1983)

Carlos is a strange guy, very isolated from society and introverted. He is obsessed with Berta, his neighbor. One day he saves her from a stalker, and Berta remains grateful. After a while, Berta tells Carlos that she has to go away for a short time, but Carlos doesn't believe her and thinks that Berta is gone forever. Carlos becomes increasingly obsessed with Berta to the point that he sees visions that do not distinguish between reality and fiction. Carlos sees lights, Carlos receives images of Berta bloodied, everything is very rare in his head, and Carlos has a seemingly normal greenhouse, but inside strange things happen, very strange.