November in the West Country.

Evening is closing in as murder detective Jack Caffery arrives to interview the victim of a car-jacking.

He's dealt with routine car-thefts before, but this one is different. This car was taken by force. And on the back seat was a passenger. An eleven-year-old girl. Who is still missing.

Before long the jacker starts to communicate with the police: 'It's started,' he tells them. 'And it ain't going to stop just sudden, is it?'

And Caffery knows that he's going to do it again. Soon the jacker will choose another car with another child on the back seat.

Caffery's a good and instinctive cop; the best in the business, some say. But this time he knows something's badly wrong. Because the jacker seems to be ahead of the police - every step of the way...