An undercover drugs operation results in the death of an innocent bus passenger. As a result, detective Sharky is demoted to vice squad duties. He persuades his new boss Frisco to allow him to organise a 'machine' of fellow 'loser' cops to investigate expensive hookers and possible political corruption, which is bad news for a ruthless white slaver and political puppeteer called Victor. Sharky institutes a 24-hour surveillance on a high-class prostitute, Dominoe, becoming obsessed with the girl and determined to prevent her possible elimination. But a hired killer called Billy Score does reach her apartment door.