Detective Sergeant Dave Bannion is investigating the apparent suicide of fellow officer Tom Duncan. He uncovers corruption within the police force and discovers Duncan was connected to underworld crime, particularly to mob boss Mike Lagana. Bannion's probing upsets his superiors and infuriates Lagana, leading to threats against him and his family. Despite the intimidation, Bannion remains resolute in his quest for justice. His determination places him at odds with both the criminal underworld and those within his own department who prefer to keep the status quo.

As Bannion digs deeper, he finds an ally in Debby Marsh, the girlfriend of Lagana's sadistic enforcer, Vince Stone. Debby provides Bannion with crucial information that brings him closer to exposing the deep-seated corruption. The dangers escalate, and Bannion faces severe personal loss that strengthens his resolve. His relentless pursuit of the truth brings him into direct conflict with Stone, setting up a dramatic confrontation. Through a blend of tenacity and courage, Bannion navigates a treacherous path as he battles to bring justice to his fallen colleague and clean up the corrupt system.