8am: an explosion rocks a London cafe. Minutes later a call is made to a local radio station: 'We've just detonated a bomb. Another will explode shortly to prove what we are capable of. The British government has until midnight tonight to meet all our demands, or a far greater attack will take place somewhere in this country that will bring fire down on all your heads. You have been warned ...' Sixteen hours is all DC Tina Boyd and DI Mike Bolt have to find and stop the killers - before it's too late.