After a security guard is shot down when trying to stop a diamond vault robbery, the investigating detective is determined to prove that the guard had taken a bribe from the robbers and wants to nail him for aiding the thieves. The guard is an old friend of Hooker's who knows that his friend wouldn't have been involved. As he and Romano investigate to find out the true circumstances it seems as if the detective is willing to go to any lengths, including blackmail, to see that he is covered in glory for his busts and quickly fly through the ranks...

Hooker and Romano get caught up in the dispute between an independent trucker and the ruthless wholesaler who is sabotaging the trucker's operations. Against the wishes of his superiors, Hooker insists that he intervene in the situation before the truckers tire against the lack of action taken against the saboteurs, and become vigilantes to deal with things themselves. A new female Police commissioner who doesn't agree with Hooker's methods does not exactly help matters...

As Hooker and Romano pursue a pair of thieves who have stolen a batch of valuable new furs, Hooker rescues the robbers' hostage - a model who turns out to be an ex-girlfriend of Romano's. Brought back together by the incident, Romano and the girl become close, and Romano quickly develops deep feelings her. But unbeknown to him, she is actually involved with the thieves, and is giving them information that she's extracting from Romano to help them plan their next heist...