Marty Kingston (Liotta) is an undercover narcotics detective who is shot and barely survives a drug bust gone wrong to save the life of his partner. When his partner is killed by a masked gunman four years later, Marty must team up with hothead homicide detective Dan Sullivan (Hatosy) to investigate a string of brutal cop murders and hunt down the cop killer. The investigation that ensues is shrouded in deception and loaded with plot twists that question the line between the rules of law and justice.