Seven reality show contestants are stranded in the Welsh mountains and have no idea what they've agreed to. These strangers are all hiding something. If another contestant correctly guesses the information, they will not only be removed but also be revealed live on camera. They are trapped and the stakes are higher than they could have ever imagined. The drama wasn't planned to include a participant going missing. Detective Ffion Morgan must put what she has seen on screen aside and learn more about these people, even though she knows she can't trust any of them. And Ffion knows that every one of her suspects has an alibi and a secret worth dying for when a murderer strikes.