Austria, Krampusnacht 1977. All the good children are given gifts by St Nicholas and all the bad ones are punished by the demonic Krampus. Julian and Kathy arrive for a holiday with their family. But who has been good and who has been bad?

When Arthur Flitwick finds an old mobile phone in his local graveyard, he makes the mistake of trying to contact the owner. But some mysteries are best left unsolved, and as Halloween draws near Arthur is plunged into a nightmare of his own making. It seems that no good deed can go unpunished, in this world or the next.

Using archive material, interviews and behind-the-scenes footage, Reece Shearsmith and Steve Pemberton go on a journey through the life and death of their dark, award-winning comedy.