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!