There is something horribly wrong with the bodies present from the darkened city roads. Many are mutilated while some possess the Price equation (w?z = Cov (w,z) = ?wzVz) carved into the own flesh. Detective Eddie Argo and his partner Helen Westcott uncover the significance of the equation that is odd and realise each casualty has been offered a choice: kill your loved ones, or be murdered. It becomes clear that the perpetrator is presently dealing with seeking an easy method to address this issue and has suffered a similar fate.