If he sounds too good to be true, then he probably wants to kill you! DCI Fenton is back to track down a vigilante killer on a mission. He lures his victims via the DoMe dating website, bragging about his crimes over social media with his own hashtag - #SocialJustice. Fenton is six months away from retirement and must take on a case which has baffled detectives for two years. The victims are all criminals who have been wrongly acquitted of serious crimes. The press accuse the Police of not caring about the victims, and the public don't give a damn either, but, of course, nobody's allowed to say that! The investigation identifies the elusive Mr X as the prime suspect. He lures his victims with promises of love, lust and whatever else is needed to gain their trust. This usually takes about half an hour, as he's a ridiculously hot guy! When the team uncover links to a previous investigation, it becomes clear that Mr X is not working alone. Who is Mrs X, and what is her end goal? Will Fenton retire with an undefeated record, or will he stumble at the final hurdle and pay the ultimate price?