Let me explain something, Number Four. From this moment, you belong to us.Two strangers with one overwhelming link: fear. For him, it's fear of losing his mind. For her, it's the fear is of losing her life...Retired professor Adrian Thomas knows all about fear from a lifetime studying human psychology. Now he's been diagnosed with degenerative dementia, all his thoughts are of ending his own life while he still can.But before he can put the gun to his head he witnesses a kidnapping: a beautiful teenage girl, snatched off the street and bundled into a white van. Jennifer Riggins been picked up by a twisted couple who run the elite subscription only website, What Comes Next. Viewers can watch what torture befalls their victims and Jennifer is to become the latest star, Victim Number Four.When the police dismiss Adrian as a confused old man, he knows he might be this young girl's only hope and he begins the race to save her. But, with Adrian's grip on reality fading with each day, it's not only Jennifer whose life hangs in the balance...