Crime Club social media stars Chloe Morrison and Joe Hooper seem to have it all - until their bodies are found following an anonymous phone call to their high-profile agent. Tied and bound to chairs facing each other, their violent deaths cause a media scrum to descend on Liverpool, with DI David Murphy and DS Laura Rossi assigned to the case. Murphy is dismissive, but the media pressure intensifies when another couple is found in the same manner as the first. Only this time the killer has left a message. A link to a private video on the internet, and the words 'Nothing stays secret'. It quickly becomes clear that more people will die; that the killer believes secrets and lies within relationships should have deadly consequences ...