When a jogger is discovered struck down by a javelin on a London common, it is clearly no ordinary murder and specialist police unit "Unlucky 13" are sent to investigate. Led by DCI Paul Walker, these elite detectives soon find themselves in a race against time to stop a ruthless killer taking revenge on England's schools inspectors. Every school holiday sees a new horror being discovered, as more and more bizarre methods of bloody revenge are used to kill more and more of these inspectors. And yet it is DCI Paul Walker's personal demons which threaten to tear apart the team, as his appetite for destruction leads him and his team into darker and darker territory. This revenge thriller is the first in a series of books to feature "Unlucky 13" and is a modern day twist on a classic format.