From Amazon Prime:

A horrific double murder shocks two families living in isolated rural Scotland. In the aftermath of the tragedy, they are faced with a terrible dilemma when the murderer arrives on their doorstep one stormy night. His fate lies in their hands – will they show mercy or get their revenge?

From Amazon Prime you can stream the 4 one-hour episodes of the only season available for this British murder story.   Hiding guilt is the main theme of the series. Familiar British actors include Juliet Stevenson as Louise Elliott and John Lynch as Bill Douglas.

Well worth watching.