Clyde Shelton is an upstanding family man whose wife and daughter are brutally murdered during a home invasion. When the killers are caught, Nick Rice, a hotshot Philadelphia prosecutor offers one of the suspects a light sentence in exchange for testifying against his accomplice. Fast forward ten years. The man who got away with murder is found dead and Clyde Shelton coolly admits his guilt. Then he issues a warning to Nick – fix the flawed justice system that failed his family, or key players in the trial will die. Shelton quickly follows through on his threats, orchestrating a string of spectacularly diabolical assassinations that can be neither predicted nor prevented - and all from his jail cell. Only Nick can stop the killings that have the city gripped with fear as Shelton’s high-profile targets are slain one after another. To do so he must outwit this brilliant sociopath in a contest of wills. With his own family in the crosshairs Nick is in a deadly race against time to bring down a lethal adversary who seems always to be one murderous step ahead.