During a crack epidemic two narcotics agents hunting for a cop killer. Hoping for leads, Moran and Thorton pay off a junkie informant. To provide for his wife and son, Moran involves the stool pigeon in a deadly scheme. This causes the partners to come under the scrutiny of a suspicious internal affairs agent.

Bodies are turning up around the city, each having met a uniquely gruesome demise. As the investigation proceeds, evidence points to one suspect: John Kramer, the man known as Jigsaw, who has been dead for over 10 years.