The latest in a series of armed robberies on super-markets leaves a young cashier possibly paralysed when the thieves take her hostage and then push her from their speeding car to slow up the pursuing cops. The cars used by the robbers are specially modified "hill racers", leading to the local hill racing champion, an old friend of Hooker's, being wrongly arrested as the prime suspect. Hooker must prove his innocence by speeding after the real culprits...

The hunt for a serial arsonist that is torching condemned buildings intensifies when a Private Investigator, who is an ex-cop and an old friend of Hooker's, is murdered. Certain that the man was on the verge of finding out who is behind the attacks, Hooker and Romano work with his daughter, who is also a PI, to bring the arsonist to justice...