THE THREAT

8am: an explosion blasts through a cafe in Central London.

THE ULTIMATUM

Minutes later, a call from an unknown terror group warns that a far greater attack will be launched in

12 hours' time.

THE PRISONER

William Garrett, AKA Fox, is awaiting trial for mass murder. He claims he can name the bombers. But only at a price.

THE CLOCK IS TICKING

It's a terrifying race against time for DI Mike Bolt and DC Tina Boyd as they chase their targets across the city in a desperate bid to stop a major atrocity - before it's too late ...