There's something horribly wrong with all the bodies observed from the dark city streets. Many are mutilated while others have the Price equation (w?z = Cov (w/ z) = ?wzVz) carved into the flesh. Detective Eddie Argo and forgive each prey is being given a choice: kill your nearest and dearest and his newest partner Helen Westcott uncover the meaning of the strange equation, or be murdered. It becomes evident that with trying a way to solve this issue, the perpetrator has suffered an identical fate and is dealing.