"Black Mirror" is an anthology show a bit like "The Twilight Zone" but also much darker and with an emphasis how near-future technology can make our lives horrid. This episode clearly is about the horrid.
When the story begins, a young lady arrives at a crappy little museum in the middle of the desert. The place is called 'The Black Museum'...a term inspired by the British Black Museum of crime and criminals that actually does exist. She is soon shown in by the owner, Rolo Haynes...a guy who seems to really enjoy frightening his patrons and regaling them with stories of misery and death. Unlike other episobdes I've seen of "Black Mirror", this one consists of several short stories--all horrid and all which in some way involved Rolo in his old job of selling strange technology to folks at a hospital. I could summarize the three tales but frankly you're better off just seeing them and being surprised.
Throughout his little tour of his chamber of murder and horror, Rolo seems to enjoy this very much. In many ways, he's at least partially responsible for much of the misery and you hope that there is an accounting for his actions. And, don't worry...there certainly is!
As with many episodes of the series, the only problem with it is that at times it's too vivid and too grotesque. This is NOT a show for children and the easily offended!! Still, like so many episodes it's incredibly imaginative and well written...and well worth seeing.