It's Christmas and Gemma has hired a lovely cottage in a quaint village. Terry spots that the village has a Santa competition, but things take a dark turn as competitors start being killed off in a host of warped and festive ways.

Apocalypse Slough: A Murder, They Hope Mystery sees Gemma recruited by the SCA (Serious Crimes Agency). This is a dream come true for Gemma, finally becoming what she's always wanted to be: an official, ball busting, kick ass, specially trained investigator. While she is delighted, sadly the SCA don't want Terry because of his criminal past.