This is not a slasher film (in the traditional sense)) but certainly reveals a lot of physical, mental and sexual pain as inflicted by a middle aged misanthropic psychopath. The sadist, in this case, is an outwardly mild mannered concierge in a Spanish apartment building who vacillates between suicidal urges and drives to inflict humiliation and degradation on the unfortunate tenants and neighbors in his building. He is at his worse when other are happy, and most at peace when others despair. Even his own ailing mother doesn't escape his hatred. So, be prepared for a discomforting adventure that is well-acted and truly believable. English subtitles.