From IMDB;
During a snowy Christmas season in Sweden, psychologist and profiler Inger Johanne Vik and her autistic daughter both get drawn into the investigation of a number of disturbing deaths.
From PBS Masterpiece Streaming you can stream the 8 episodes of this Swedish mystery series. Each episode lasts about 45 minutes.
Just because the villain intends to kill multiple victims does not, as I understand the term, make the villain a serial killer. Rather in this well-done series his motive has a homicidal rationality. But I will leave it up to you to guess for yourself that motive before the profiler Inger Vik realizes what is happening.
Many well-presented characters interact. Throw a romance into the pot and the result is successful suspense.
DO NOT MISS!
From Netflix:
A single mother enters a world of twisted mind games when she begins an affair with her psychiatrist boss while secretly befriending his mysterious wife.
From Netflix you can stream the 6 episodes of this British romantic thriller. Each episode lasts about 50 minutes.
Louise is a divorced mother with one child Adam. David, a psychiatrist, is Louise’s boss and Adele’s husband. Adele is a mysterious childless stay-at-home housewife. David and Adele are not happily married. But their relationship is more ominous rather than merely not getting along. David and Louise are having a difficult affair, not the least because Louise has befriended Adele. Rob is a gay young man who has become Adele’s best friend after Rob and Adele met during their mutual confinement in a mental institution.
If you are not yet intrigued, then throw in a paranormal element (which perfectly suits the plot and is not the least bit hokey) and lots of sex scenes. Finally, this story has one of the best surprise endings I have ever seen.
If this last paragraph appeals to you, then DO NOT MISS!
Films Tony is comfortable recommending.