Sidney Poitier reprises his role as Lt. Virgil Tibbs in this taut drama that exposes the ruthless, high-stakes world of international drug trafficking. Under the cover of darkness, six masked figures raid a seemingly respectable furniture factory - and steal a multimillion-dollar cache of heroin! But these are no ordinary crooks. They're a passionate band of former users-turned-vigilantes whose frustration with the law's inability to combat the city's drug problem spurs them to take on a powerful narcotics ring. After contacting Tibbs, they confess to the break-in, beg him to keep silent and ask for his help. But once he reluctantly agrees to operate outside the law, Tibbs soon finds himself at odds with the police and a ruthless drug syndicate that will stop at nothing to silence him!