What Comes Next — John Katzenbach

When a retired academician witnesses a lovely young woman snatched off the street, he is unsatisfied by the police response and vows to find her on his own. She has been kidnapped and held prisoner by a married couple who have started an exclusive website, named “What Comes Next,” on which viewers can watch, in real time, what befalls their victims.

What befalls the pretty teenager at the hands of the depraved couple, as thousands follow every moment of her nightmare, provides one of the most terrifying novels of the year.