Wounded. Exhausted. Losing blood. The figure in the mask stumbles through the streets. Closing in are others in masks but they don't stumble, they stalk. They carry machetes, clubs and knives. And they know how to use them. They've killed before and they're going to kill again. Who is kidnapping seemingly random victims and then slaughtering them in an elaborate game of cat and mouse? And why are these murders being streamed over the internet? Watching the horror unfold at New Scotland Yard is Detective Inspector Joe Chapman and his team. Chapman searches for clues, hints - anything that might tell him where and when this savage hunt is happening. He'd give anything to know. He'd give almost anything to stop them. Unfortunately for DI Chapman, 'almost' anything might not be enough ...