Tony Giani (John Derek) is a handsome pimp who preys on naive young women who arrive in London looking for fame and fortune. He wines and dines them and gets them a place to stay but soon blackmails them into prostitution. One such girl is pretty Italian Marissa (Milly Vitale) who instantly falls under Giants wicked spell. But when Milly tries to escape her tawdry surroundings her life is put in mortal danger. It seems that only a kindly investigative journalist (William Franklyn) can rescue Marissa from her life stuck in the sordid gutters of Soho.