The figure in the mask stumbles bleeding through the streets, his pursuers closing in. They also wear masks, but they don't stumble. They stalk. They carry machetes, clubs and knives. And they know how to use them . . 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 who searches for clues, hints - anything that might tell him where and when this savage hunt is happening. He'd give anything to know.

But DI Chapman is about to learn that you should be careful what you wish for. Very soon, he will be closer to the blood-letting than he could have imagined. Forced to fight for his life and the life of someone he holds dear, the only way out looks to be to rack up the biggest body count. But even that might not be enough.