Apocalypse Slough sees Gemma achieve her dreams of becoming an official, ball busting, kick ass investigator at the Serious Crimes Agency (SCA), whilst Terry is denied the dream thanks to his colourful criminal history. With this new strain on their relationship, they're thrown in headfirst to crack a curious double murder at a local rugby club - whose members seem to have dark and disturbing secrets of their own. As Gemma leads them closer into the complex case, questions begin to arise about their partnership and the mysteries they uncover. If Gemma doesn't pick up the pace, it could be game over for everyone; her and Terry included!