It's the height of summer and a sweltering weekend in London. Riz and Holly have been tasked with taking a jihadi prisoner to an MI6 facility in Portsmouth for debriefing. So far, so routine. But after a full-scale bloodbath of a firefight at the Dartford Crossing, they realise that they haven't got any average prisoner on their hands. This one knows something, and that something has the CIA after them. And worse... Riz and Holly will have to ditch all their hi-tech gear and use their survival smarts to evade their hunters, as the road trip turns into an epic pursuit across the landscape of southern England, using half-remembered stay behind networks from the Cold War and further back still... and as they dig themselves in and out of trouble on the way to a final showdown in a sleepy market town, they realise that the man they're escorting may also figure in their history, too...