Part 1

In 2024, the body of 65-year-old groundsman Brian Low is discovered on a country track in rural Aberfeldy, his beloved black labrador Millie by his side. Police assume that Brian has suffered a medical episode, but six days later, the post-mortem reveals the shocking truth - Brian has been shot dead. His former colleague and gamekeeper on the estate where he worked, David Campbell, now stands trial for his murder.

With the site of the murder exposed to the elements for days, police are unable to forensically link anyone to the deceased. The prosecution builds a case against the accused around smaller, individual strands of circumstantial evidence while working to convince the jury that he is guilty beyond reasonable doubt.