It’s a ‘less-than-merry’ Christmas for the forensics team as they attend a crime scene at a posh house in the country, and you may find yourself shouting at the screen as Nikki (Emilia Fox) goes walkabout despite the fact that there is apparently a gunman still at large.

She even goes down to the basement which, as horror fans know, is never a good idea.

The clues come thick and fast as the team do a sweep – burned-out car, three dead bodies, firearms, drugs, fake passports and even a horse with a gunshot wound! As Jack (David Caves) observes: ‘This is not the Christmas I was expecting…’

The case concludes tomorrow…