Sidney Poitier is back as Lt. Virgil Tibbs! When six masked figures rob a seemingly normal furniture factory, they leave with a multimillion-dollar cache of heroin! But they're no ordinary crooks. They're a band of vigilantes frustrated with the law's inability to fight the city's drug problem. After contacting Tibbs, they confess to the break-in and ask for his help. But Tibbs soon finds himself at odds with the police and a ruthless drug syndicate...