Grant Cairns is a Glasgow-based private investigator. He is contracted to investigate a company called Caledonia Data (CalDat) which is suspected of channelling dark money to far-right groups, and also being involved in the Cambridge Analytica scandal. Ex-DS Amanda Pitt is living a life of box sets, painkillers and gin. When a former colleague tells her about an apparently racially motivated fatal stabbing in a Glasgow hotel, where the murderer could not have known the victim and who died at the scene, she becomes intrigued. She gets Grant Cairns involved, and they find that their cases are inter-linked. As they work, they enlist the help of computer expert Martin McGregor and his genius hacker protégé Michael. For Martin, the world of online abuse and fake news gets very personal. And for MSP Julia Ross, a passionate believer in people's rights - especially the LGBT agenda - and online accountability, the hate and trolling will have fatal consequences, unless Cairns, Amanda, and Martin and Michael can save her.