From Acorn TV:

In this “very superior psychological drama” (Daily Express, UK), happily married teacher Ellie (Anna Friel, Pushing Daisies, Marcella) is devastated when her husband (Marc Warren, The Good Wife) dies in a car crash–with another woman in his car. The police dismiss it as an extramarital affair, but Ellie feels certain that something is not right and determines to learn the truth about the accident.

From Acorn TV you can stream this 3 episode British TV series. Each episode lasts about 46 minutes.

One death leads to more deaths, all of which are really accidents or suicide or may have been made to appear as such.  For most of the 3 episodes only the grieving wife Ellie is convinced of foul play. Her supportive friends don’t give up on her, even as she stubbornly investigates.  At times even I was convinced she was delusional.  After watching the last episode, Kathy and I agreed it was a really good presentation.

Well worth your time.